diff --git a/examples/sample.ipynb b/examples/sample.ipynb
index 849bed8..70ed68c 100644
--- a/examples/sample.ipynb
+++ b/examples/sample.ipynb
@@ -97,8 +97,8 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "\u001b[1m\n",
-      "============================= Pipeline Overview =============================\u001b[0m\n",
+      "\u001B[1m\n",
+      "============================= Pipeline Overview =============================\u001B[0m\n",
       "\n",
       "#   Component         Assigns               Requires   Scores             Retokenizes\n",
       "-   ---------------   -------------------   --------   ----------------   -----------\n",
@@ -124,7 +124,7 @@
       "                                                                                     \n",
       "6   textrank                                                              False      \n",
       "\n",
-      "\u001b[38;5;2m✔ No problems found.\u001b[0m\n"
+      "\u001B[38;5;2m✔ No problems found.\u001B[0m\n"
      ]
     },
     {
@@ -173,16 +173,16 @@
        "  'lemmatizer': [],\n",
        "  'ner': [],\n",
        "  'textrank': []},\n",
-       " 'attrs': {'token.ent_iob': {'assigns': ['ner'], 'requires': []},\n",
+       " 'attrs': {'token.dep': {'assigns': ['parser'], 'requires': []},\n",
        "  'token.ent_type': {'assigns': ['ner'], 'requires': []},\n",
-       "  'token.tag': {'assigns': ['tagger'], 'requires': []},\n",
-       "  'token.dep': {'assigns': ['parser'], 'requires': []},\n",
        "  'token.head': {'assigns': ['parser'], 'requires': []},\n",
-       "  'doc.sents': {'assigns': ['parser'], 'requires': []},\n",
-       "  'doc.ents': {'assigns': ['ner'], 'requires': []},\n",
+       "  'token.is_sent_start': {'assigns': ['parser'], 'requires': []},\n",
+       "  'token.ent_iob': {'assigns': ['ner'], 'requires': []},\n",
        "  'doc.tensor': {'assigns': ['tok2vec'], 'requires': []},\n",
+       "  'doc.ents': {'assigns': ['ner'], 'requires': []},\n",
+       "  'doc.sents': {'assigns': ['parser'], 'requires': []},\n",
        "  'token.lemma': {'assigns': ['lemmatizer'], 'requires': []},\n",
-       "  'token.is_sent_start': {'assigns': ['parser'], 'requires': []}}}"
+       "  'token.tag': {'assigns': ['tagger'], 'requires': []}}}"
       ]
      },
      "execution_count": 4,
@@ -276,7 +276,7 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "ic| tr.elapsed_time: 5.707979202270508\n"
+      "ic| tr.elapsed_time: 7.581949234008789\n"
      ]
     }
    ],
@@ -306,103 +306,99 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "ic| phrase.rank: 0.17054248030845812\n",
+      "ic| phrase.rank: 0.18359439311764025\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'mixed types'\n",
       "ic| phrase.chunks: [mixed types]\n",
-      "ic| phrase.rank: 0.15757771579579002\n",
-      "    phrase.count: 1\n",
-      "    phrase.text: 'minimal generating sets'\n",
-      "ic| phrase.chunks: [minimal generating sets]\n",
-      "ic| phrase.rank: 0.1573942320091846\n",
+      "ic| phrase.rank: 0.1784796193107821\n",
       "    phrase.count: 3\n",
       "    phrase.text: 'systems'\n",
       "ic| phrase.chunks: [systems, systems, systems]\n",
-      "ic| phrase.rank: 0.14894241299658317\n",
+      "ic| phrase.rank: 0.15037838042245094\n",
+      "    phrase.count: 1\n",
+      "    phrase.text: 'minimal generating sets'\n",
+      "ic| phrase.chunks: [minimal generating sets]\n",
+      "ic| phrase.rank: 0.14740065982407313\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'nonstrict inequations'\n",
       "ic| phrase.chunks: [nonstrict inequations]\n",
-      "ic| phrase.rank: 0.14039169904589088\n",
+      "ic| phrase.rank: 0.13946027725597837\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'strict inequations'\n",
       "ic| phrase.chunks: [strict inequations]\n",
-      "ic| phrase.rank: 0.11698198658021898\n",
-      "    phrase.count: 1\n",
-      "    phrase.text: 'natural numbers'\n",
-      "ic| phrase.chunks: [natural numbers]\n",
-      "ic| phrase.rank: 0.11559770516796158\n",
+      "ic| phrase.rank: 0.1195023546245721\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'linear Diophantine equations'\n",
       "ic| phrase.chunks: [linear Diophantine equations]\n",
-      "ic| phrase.rank: 0.11407086615794945\n",
+      "ic| phrase.rank: 0.11450088293222845\n",
+      "    phrase.count: 1\n",
+      "    phrase.text: 'natural numbers'\n",
+      "ic| phrase.chunks: [natural numbers]\n",
+      "ic| phrase.rank: 0.10780718173686318\n",
       "    phrase.count: 3\n",
       "    phrase.text: 'solutions'\n",
       "ic| phrase.chunks: [solutions, solutions, solutions]\n",
-      "ic| phrase.rank: 0.10165710454752863\n",
+      "ic| phrase.rank: 0.10529828014583348\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'linear constraints'\n",
       "ic| phrase.chunks: [linear constraints]\n",
-      "ic| phrase.rank: 0.09237587396226833\n",
+      "ic| phrase.rank: 0.1036960590708142\n",
+      "    phrase.count: 1\n",
+      "    phrase.text: 'all the considered types systems'\n",
+      "ic| phrase.chunks: [all the considered types systems]\n",
+      "ic| phrase.rank: 0.08812713074893187\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'a minimal supporting set'\n",
       "ic| phrase.chunks: [a minimal supporting set]\n",
-      "ic| phrase.rank: 0.08845296671843554\n",
+      "ic| phrase.rank: 0.08243620500315359\n",
       "    phrase.count: 1\n",
-      "    phrase.text: 'all the considered types systems'\n",
-      "ic| phrase.chunks: [all the considered types systems]\n",
-      "ic| phrase.rank: 0.08294839224739124\n",
+      "    phrase.text: 'a system'\n",
+      "ic| phrase.chunks: [a system]\n",
+      "ic| phrase.rank: 0.07944607954086784\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'a minimal set'\n",
       "ic| phrase.chunks: [a minimal set]\n",
-      "ic| phrase.rank: 0.08107274369298882\n",
+      "ic| phrase.rank: 0.0763527926213032\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'algorithms'\n",
       "ic| phrase.chunks: [algorithms]\n",
-      "ic| phrase.rank: 0.07429406639612553\n",
-      "    phrase.count: 1\n",
-      "    phrase.text: 'construction'\n",
-      "ic| phrase.chunks: [construction]\n",
-      "ic| phrase.rank: 0.07269728177551771\n",
+      "ic| phrase.rank: 0.07593126037016427\n",
       "    phrase.count: 1\n",
-      "    phrase.text: 'a system'\n",
-      "ic| phrase.chunks: [a system]\n",
-      "ic| phrase.rank: 0.07130948853545689\n",
+      "    phrase.text: 'all types'\n",
+      "ic| phrase.chunks: [all types]\n",
+      "ic| phrase.rank: 0.07309361902551355\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'Diophantine'\n",
       "ic| phrase.chunks: [Diophantine]\n",
-      "ic| phrase.rank: 0.07034880604533804\n",
-      "    phrase.count: 1\n",
-      "    phrase.text: 'all types'\n",
-      "ic| phrase.chunks: [all types]\n",
-      "ic| phrase.rank: 0.06480303503167001\n",
+      "ic| phrase.rank: 0.0702090100898443\n",
       "    phrase.count: 1\n",
-      "    phrase.text: 'Upper bounds'\n",
-      "ic| phrase.chunks: [Upper bounds]\n",
-      "ic| phrase.rank: 0.05969087234318076\n",
+      "    phrase.text: 'construction'\n",
+      "ic| phrase.chunks: [construction]\n",
+      "ic| phrase.rank: 0.05800111772673988\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'the set'\n",
       "ic| phrase.chunks: [the set]\n",
-      "ic| phrase.rank: 0.05837512270115124\n",
+      "ic| phrase.rank: 0.054251394765316464\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'components'\n",
       "ic| phrase.chunks: [components]\n",
-      "ic| phrase.rank: 0.048602276273752514\n",
+      "ic| phrase.rank: 0.04516904342912139\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'Compatibility'\n",
       "ic| phrase.chunks: [Compatibility]\n",
-      "ic| phrase.rank: 0.048602276273752514\n",
+      "ic| phrase.rank: 0.04516904342912139\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'compatibility'\n",
       "ic| phrase.chunks: [compatibility]\n",
-      "ic| phrase.rank: 0.0472624878442175\n",
+      "ic| phrase.rank: 0.04435648606848154\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'the corresponding algorithms'\n",
       "ic| phrase.chunks: [the corresponding algorithms]\n",
-      "ic| phrase.rank: 0.04548690742119631\n",
+      "ic| phrase.rank: 0.042273783712246285\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'Criteria'\n",
       "ic| phrase.chunks: [Criteria]\n",
-      "ic| phrase.rank: 0.021009502595385022\n",
+      "ic| phrase.rank: 0.01952542432474353\n",
       "    phrase.count: 1\n",
       "    phrase.text: 'These criteria'\n",
       "ic| phrase.chunks: [These criteria]\n"
@@ -418,7 +414,11 @@
   {
    "cell_type": "markdown",
    "id": "medium-vertex",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   },
    "source": [
     "## Stop Words\n",
     "\n",
@@ -430,6 +430,9 @@
    "execution_count": 9,
    "id": "separated-mambo",
    "metadata": {
+    "pycharm": {
+     "name": "#%%\n"
+    },
     "scrolled": true,
     "tags": []
    },
@@ -438,16 +441,16 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "ic| phrase: Phrase(text='words', chunks=[words, words], count=2, rank=0.15746606699141763)\n",
-      "ic| phrase: Phrase(text='sentences', chunks=[sentences], count=1, rank=0.12965916420829138)\n",
-      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.10571655249620954)\n",
-      "ic| phrase: Phrase(text='the remaining words', chunks=[the remaining words], count=1, rank=0.09329379463860477)\n",
-      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.08981955768260336)\n",
-      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.0843351188899575)\n",
-      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.07936404910104827)\n",
-      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07400094270083186)\n",
-      "ic| phrase: Phrase(text='every other sentence', chunks=[every other sentence], count=1, rank=0.07073416034725326)\n",
-      "ic| phrase: Phrase(text='original TextRank', chunks=[original TextRank], count=1, rank=0.06710956557420322)\n"
+      "ic| phrase: Phrase(text='words', chunks=[words, words], count=2, rank=0.16137018222637944)\n",
+      "ic| phrase: Phrase(text='sentences', chunks=[sentences], count=1, rank=0.13367291641220508)\n",
+      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.1095023226326187)\n",
+      "ic| phrase: Phrase(text='et al', chunks=[et al], count=1, rank=0.10745197034799042)\n",
+      "ic| phrase: Phrase(text='Barrios et al', chunks=[Barrios et al], count=1, rank=0.10502825160040344)\n",
+      "ic| phrase: Phrase(text='the remaining words', chunks=[the remaining words], count=1, rank=0.09559863808781449)\n",
+      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09162794519014893)\n",
+      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.08555365347028678)\n",
+      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.07894442579092492)\n",
+      "ic| phrase: Phrase(text='algorithm', chunks=[algorithm], count=1, rank=0.07747520663125698)\n"
      ]
     }
    ],
@@ -481,16 +484,16 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "ic| phrase: Phrase(text='sentences', chunks=[sentences], count=1, rank=0.14407775200046075)\n",
-      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.11286475216345385)\n",
-      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09589788430130489)\n",
-      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09004754289053603)\n",
-      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08473538778364878)\n",
-      "ic| phrase: Phrase(text='every other sentence', chunks=[every other sentence], count=1, rank=0.07909136977858265)\n",
-      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07900911166567022)\n",
-      "ic| phrase: Phrase(text='original TextRank', chunks=[original TextRank], count=1, rank=0.07165073049436399)\n",
-      "ic| phrase: Phrase(text='TextRank', chunks=[TextRank, TextRank, TextRank, TextRank], count=4, rank=0.06888311869751775)\n",
-      "ic| phrase: Phrase(text='every sentence', chunks=[every sentence], count=1, rank=0.06654666312136172)\n"
+      "ic| phrase: Phrase(text='sentences', chunks=[sentences], count=1, rank=0.1490464677880926)\n",
+      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.117318519527749)\n",
+      "ic| phrase: Phrase(text='et al', chunks=[et al], count=1, rank=0.11512161354108796)\n",
+      "ic| phrase: Phrase(text='Barrios et al', chunks=[Barrios et al], count=1, rank=0.11252482346188267)\n",
+      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09816426515530181)\n",
+      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09165889278462461)\n",
+      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08457790386936588)\n",
+      "ic| phrase: Phrase(text='algorithm', chunks=[algorithm], count=1, rank=0.08300479194058319)\n",
+      "ic| phrase: Phrase(text='every other sentence', chunks=[every other sentence], count=1, rank=0.08179233228776425)\n",
+      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07919192237459494)\n"
      ]
     }
    ],
@@ -532,16 +535,16 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "ic| phrase: Phrase(text='sentences', chunks=[sentences, the sentences], count=2, rank=0.14407775200046075)\n",
-      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.11286475216345385)\n",
-      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09589788430130489)\n",
-      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09004754289053603)\n",
-      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08473538778364878)\n",
-      "ic| phrase: Phrase(text='sentence', chunks=[every sentence, every other sentence], count=2, rank=0.07909136977858265)\n",
-      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07900911166567022)\n",
-      "ic| phrase: Phrase(text='original TextRank', chunks=[original TextRank], count=1, rank=0.07165073049436399)\n",
-      "ic| phrase: Phrase(text='TextRank', chunks=[TextRank, TextRank, TextRank, TextRank], count=4, rank=0.06888311869751775)\n",
-      "ic| phrase: Phrase(text='two sentences', chunks=[the two sentences, two sentences], count=2, rank=0.06654666312136172)\n"
+      "ic| phrase: Phrase(text='sentences', chunks=[sentences, the sentences], count=2, rank=0.1490464677880926)\n",
+      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.117318519527749)\n",
+      "ic| phrase: Phrase(text='et al', chunks=[et al], count=1, rank=0.11512161354108796)\n",
+      "ic| phrase: Phrase(text='Barrios et al', chunks=[Barrios et al], count=1, rank=0.11252482346188267)\n",
+      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09816426515530181)\n",
+      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09165889278462461)\n",
+      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08457790386936588)\n",
+      "ic| phrase: Phrase(text='algorithm', chunks=[algorithm], count=1, rank=0.08300479194058319)\n",
+      "ic| phrase: Phrase(text='sentence', chunks=[every sentence, every other sentence], count=2, rank=0.08179233228776425)\n",
+      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07919192237459494)\n"
      ]
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    ],
@@ -610,16 +613,16 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
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-      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.11286475216345385)\n",
-      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09589788430130489)\n",
-      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09004754289053603)\n",
-      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08473538778364878)\n",
-      "ic| phrase: Phrase(text='other sentence', chunks=[every other sentence], count=1, rank=0.07909136977858265)\n",
-      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07900911166567022)\n",
-      "ic| phrase: Phrase(text='original TextRank', chunks=[original TextRank], count=1, rank=0.07165073049436399)\n",
-      "ic| phrase: Phrase(text='TextRank', chunks=[TextRank, TextRank, TextRank, TextRank], count=4, rank=0.06888311869751775)\n",
-      "ic| phrase: Phrase(text='sentence', chunks=[every sentence], count=1, rank=0.06654666312136172)\n"
+      "ic| phrase: Phrase(text='sentences', chunks=[sentences, the sentences], count=2, rank=0.1490464677880926)\n",
+      "ic| phrase: Phrase(text='Mihalcea et al', chunks=[Mihalcea et al], count=1, rank=0.117318519527749)\n",
+      "ic| phrase: Phrase(text='et al', chunks=[et al], count=1, rank=0.11512161354108796)\n",
+      "ic| phrase: Phrase(text='Barrios et al', chunks=[Barrios et al], count=1, rank=0.11252482346188267)\n",
+      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09816426515530181)\n",
+      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09165889278462461)\n",
+      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08457790386936588)\n",
+      "ic| phrase: Phrase(text='algorithm', chunks=[algorithm], count=1, rank=0.08300479194058319)\n",
+      "ic| phrase: Phrase(text='other sentence', chunks=[every other sentence], count=1, rank=0.08179233228776425)\n",
+      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07919192237459494)\n"
      ]
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@@ -668,15 +671,15 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
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-      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09004754289053603)\n",
-      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08473538778364878)\n",
-      "ic| phrase: Phrase(text='every other sentence', chunks=[every other sentence], count=1, rank=0.07909136977858265)\n",
-      "ic| phrase: Phrase(text='Okapi BM25 function', chunks=[Okapi BM25 function], count=1, rank=0.07900911166567022)\n",
-      "ic| phrase: Phrase(text='original TextRank', chunks=[original TextRank], count=1, rank=0.07165073049436399)\n",
-      "ic| phrase: Phrase(text='every sentence', chunks=[every sentence], count=1, rank=0.06654666312136172)\n",
-      "ic| phrase: Phrase(text='the sentences', chunks=[the sentences], count=1, rank=0.06654666312136172)\n"
+      "ic| phrase: Phrase(text='sentences', chunks=[sentences], count=1, rank=0.1490464677880926)\n",
+      "ic| phrase: Phrase(text='gensim implements TextRank', chunks=[gensim implements TextRank], count=1, rank=0.09816426515530181)\n",
+      "ic| phrase: Phrase(text='text summarization', chunks=[text summarization], count=1, rank=0.09165889278462461)\n",
+      "ic| phrase: Phrase(text='ranking webpages', chunks=[ranking webpages], count=1, rank=0.08457790386936588)\n",
+      "ic| phrase: Phrase(text='algorithm', chunks=[algorithm], count=1, rank=0.08300479194058319)\n",
+      "ic| phrase: Phrase(text='every other sentence', chunks=[every other sentence], count=1, rank=0.08179233228776425)\n",
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-      "-rw-r--r--  1 paco  staff    17K Mar  6 14:39 lemma_graph.dot\n"
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+      "Requirement already satisfied: graphviz in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (0.19.1)\r\n"
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-      "Requirement already satisfied: numpy in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from altair) (1.21.2)\n",
-      "Requirement already satisfied: python-dateutil>=2.7.3 in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from pandas>=0.18->altair) (2.8.2)\n",
-      "Requirement already satisfied: pytz>=2017.3 in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from pandas>=0.18->altair) (2021.3)\n",
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-      "Requirement already satisfied: importlib-metadata in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from jsonschema->altair) (4.8.1)\n",
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-      "Requirement already satisfied: pyrsistent!=0.17.0,!=0.17.1,!=0.17.2,>=0.14.0 in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from jsonschema->altair) (0.18.0)\n",
-      "Requirement already satisfied: six>=1.5 in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from python-dateutil>=2.7.3->pandas>=0.18->altair) (1.16.0)\n",
-      "Requirement already satisfied: typing-extensions>=3.6.4 in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from importlib-metadata->jsonschema->altair) (3.10.0.2)\n",
-      "Requirement already satisfied: zipp>=0.5 in /Users/paco/src/pytextrank/venv/lib/python3.7/site-packages (from importlib-metadata->jsonschema->altair) (3.6.0)\n"
+      "Requirement already satisfied: altair in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (4.2.0)\n",
+      "Requirement already satisfied: jsonschema>=3.0 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from altair) (4.4.0)\n",
+      "Requirement already satisfied: jinja2 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from altair) (3.0.3)\n",
+      "Requirement already satisfied: numpy in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from altair) (1.22.3)\n",
+      "Requirement already satisfied: entrypoints in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from altair) (0.4)\n",
+      "Requirement already satisfied: toolz in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from altair) (0.11.2)\n",
+      "Requirement already satisfied: pandas>=0.18 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from altair) (1.4.1)\n",
+      "Requirement already satisfied: pyrsistent!=0.17.0,!=0.17.1,!=0.17.2,>=0.14.0 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from jsonschema>=3.0->altair) (0.18.1)\n",
+      "Requirement already satisfied: attrs>=17.4.0 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from jsonschema>=3.0->altair) (21.4.0)\n",
+      "Requirement already satisfied: importlib-resources>=1.4.0; python_version < \"3.9\" in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from jsonschema>=3.0->altair) (5.4.0)\n",
+      "Requirement already satisfied: MarkupSafe>=2.0 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from jinja2->altair) (2.1.0)\n",
+      "Requirement already satisfied: pytz>=2020.1 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from pandas>=0.18->altair) (2021.3)\n",
+      "Requirement already satisfied: python-dateutil>=2.8.1 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from pandas>=0.18->altair) (2.8.2)\n",
+      "Requirement already satisfied: zipp>=3.1.0; python_version < \"3.10\" in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from importlib-resources>=1.4.0; python_version < \"3.9\"->jsonschema>=3.0->altair) (3.7.0)\n",
+      "Requirement already satisfied: six>=1.5 in /home/ankushchander/workplace/.virtualenv/pytextrank/lib/python3.8/site-packages (from python-dateutil>=2.8.1->pandas>=0.18->altair) (1.16.0)\n"
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-       "        document.getElementsByTagName(\"head\")[0].appendChild(s);\n",
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+       "    function maybeLoadScript(lib, version) {\n",
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@@ -2572,7 +2544,11 @@
   {
    "cell_type": "markdown",
    "id": "administrative-sleeve",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   },
    "source": [
     "## Extractive Summarization\n",
     "\n",
@@ -2583,7 +2559,11 @@
    "cell_type": "code",
    "execution_count": 22,
    "id": "afraid-retail",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   },
    "outputs": [
     {
      "name": "stderr",
@@ -2591,9 +2571,9 @@
      "text": [
       "ic| sent: First, a quick description of some popular algorithms & implementations for text summarization that exist today: the summarization module in gensim implements TextRank, an unsupervised algorithm based on weighted-graphs from a paper by Mihalcea et al.\n",
       "ic| sent: Gensim’s TextRank uses Okapi BM25 function to see how similar the sentences are.\n",
-      "ic| sent: Create a graph where vertices are sentences.\n",
       "ic| sent: It is built on top of the popular PageRank algorithm that Google used for ranking webpages.\n",
-      "ic| sent: In original TextRank the weights of an edge between two sentences is the percentage of words appearing in both of them.\n"
+      "ic| sent: Create a graph where vertices are sentences.\n",
+      "ic| sent: Run the PageRank algorithm on the graph.\n"
      ]
     }
    ],
@@ -2605,7 +2585,11 @@
   {
    "cell_type": "markdown",
    "id": "02cee695-efab-4264-9738-3f5e9f765bfb",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   },
    "source": [
     "## Using TopicRank\n",
     "\n",
@@ -2616,7 +2600,11 @@
    "cell_type": "code",
    "execution_count": 23,
    "id": "7a77525e-9b74-45ba-af71-21aa8f5849f2",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   },
    "outputs": [],
    "source": [
     "nlp = spacy.load(\"en_core_web_sm\")\n",
@@ -2626,7 +2614,11 @@
   {
    "cell_type": "markdown",
    "id": "sophisticated-crossing",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   },
    "source": [
     "Let's load an example text:"
    ]
@@ -2635,7 +2627,11 @@
    "cell_type": "code",
    "execution_count": 24,
    "id": "judicial-andrews",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   },
    "outputs": [
     {
      "data": {
@@ -2657,7 +2653,11 @@
    "cell_type": "code",
    "execution_count": 25,
    "id": "96ca4cfe-1dc0-4e81-a2e8-a60ff295bf39",
-   "metadata": {},
+   "metadata": {
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   },
    "outputs": [
     {
      "name": "stderr",
@@ -2683,6 +2683,99 @@
     "    ic(phrase)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "7865c45a",
+   "metadata": {
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   },
+   "source": [
+    "## Using Biased TextRank\n",
+    "\n",
+    "The *Biased TextRank* enhanced algorithm is simple to use in the `spaCy` pipeline and it supports the other features described above:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "id": "d4d2581b",
+   "metadata": {
+    "pycharm": {
+     "name": "#%%\n"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "nlp = spacy.load(\"en_core_web_sm\")\n",
+    "nlp.add_pipe(\"biasedtextrank\");"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "id": "a83d4003",
+   "metadata": {
+    "pycharm": {
+     "name": "#%%\n"
+    },
+    "scrolled": true
+   },
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "ic| phrase: Phrase(text='Leicester', chunks=[Leicester, Leicester], count=2, rank=0.26184834028994514)\n",
+      "ic| phrase: Phrase(text='Saturday', chunks=[Saturday, Saturday], count=2, rank=0.13938186779355857)\n",
+      "ic| phrase: Phrase(text='the last 13 Premier League matches', chunks=[the last 13 Premier League matches], count=1, rank=0.12502820319236171)\n",
+      "ic| phrase: Phrase(text='none', chunks=[none], count=1, rank=1.9498221604845646e-07)\n",
+      "ic| phrase: Phrase(text='Moussa Dembele', chunks=[Moussa Dembele, Moussa Dembele], count=2, rank=8.640024414329197e-08)\n",
+      "ic| phrase: Phrase(text='Dries Mertens', chunks=[Dries Mertens, Dries Mertens], count=2, rank=5.152284728493906e-08)\n",
+      "ic| phrase: Phrase(text='Edinson Cavani', chunks=[Edinson Cavani], count=1, rank=3.076049036231119e-08)\n",
+      "ic| phrase: Phrase(text='a new centre', chunks=[a new centre], count=1, rank=2.7737546970070932e-08)\n",
+      "ic| phrase: Phrase(text='deadline day', chunks=[deadline day, deadline day], count=2, rank=1.3752326412669907e-08)\n",
+      "ic| phrase: Phrase(text='their long search', chunks=[their long search], count=1, rank=1.1267201943238505e-08)\n"
+     ]
+    }
+   ],
+   "source": [
+    "doc = nlp(text)\n",
+    "\n",
+    "focus = \"Leicester\"\n",
+    "doc._.textrank.change_focus(focus,bias=10.0,  default_bias=0.0)\n",
+    "\n",
+    "for phrase in doc._.phrases[:10]:\n",
+    "    ic(phrase)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "The top-ranked phrases from *Biased TextRank* are closely related to the \"focus\" item: `Leicester`"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "## Using PositionRank\n",
+    "\n",
+    "The *PositionRank* enhanced algorithm is simple to use in the `spaCy` pipeline and it supports the other features described above:"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% md\n"
+    }
+   }
+  },
   {
    "cell_type": "markdown",
    "id": "inner-acceptance",
@@ -2695,7 +2788,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 28,
    "id": "stock-millennium",
    "metadata": {},
    "outputs": [],
@@ -2706,7 +2799,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 29,
    "id": "compact-retention",
    "metadata": {
     "scrolled": true,
@@ -2757,7 +2850,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": 30,
    "id": "unique-domestic",
    "metadata": {
     "scrolled": true,
@@ -2773,11 +2866,11 @@
       "ic| phrase: Phrase(text='none', chunks=[none], count=1, rank=0.09802416183300769)\n",
       "ic| phrase: Phrase(text='Moussa Dembele', chunks=[Moussa Dembele, Moussa Dembele], count=2, rank=0.09341044332809736)\n",
       "ic| phrase: Phrase(text='deadline day', chunks=[deadline day, deadline day], count=2, rank=0.09046182507994752)\n",
-      "ic| phrase: Phrase(text='Dries Mertens', chunks=[Dries Mertens], count=1, rank=0.08919649435994934)\n",
-      "ic| phrase: Phrase(text='Edinson Cavani', chunks=[Edinson Cavani, Edinson Cavani], count=2, rank=0.08418633972470349)\n",
+      "ic| phrase: Phrase(text='Dries Mertens', chunks=[Dries Mertens, Dries Mertens], count=2, rank=0.08919649435994934)\n",
+      "ic| phrase: Phrase(text='Edinson Cavani', chunks=[Edinson Cavani], count=1, rank=0.08418633972470349)\n",
+      "ic| phrase: Phrase(text='Shanghai Shenhua', chunks=[Shanghai Shenhua], count=1, rank=0.08254442709505862)\n",
       "ic| phrase: Phrase(text='Salomon Rondón', chunks=[Salomon Rondón, Salomon Rondón], count=2, rank=0.08228367707127111)\n",
-      "ic| phrase: Phrase(text='Salomón Rondón', chunks=[Salomón Rondón, Salomón Rondón], count=2, rank=0.08228367707127111)\n",
-      "ic| phrase: Phrase(text='Premier League', chunks=[Premier League], count=1, rank=0.08198820712767878)\n"
+      "ic| phrase: Phrase(text='Salomón Rondón', chunks=[Salomón Rondón, Salomón Rondón], count=2, rank=0.08228367707127111)\n"
      ]
     }
    ],
@@ -2815,7 +2908,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.9"
+   "version": "3.8.10"
   }
  },
  "nbformat": 4,
diff --git a/pytextrank/biasedrank.py b/pytextrank/biasedrank.py
index 0135882..b6fa2f3 100644
--- a/pytextrank/biasedrank.py
+++ b/pytextrank/biasedrank.py
@@ -76,10 +76,10 @@ def _get_node_bias (
     returns:
 bias to apply for the *node weight*
         """
-        if token.text in self.focus_tokens:
+        if token.text.lower() in self.focus_tokens:
             return self.node_bias
 
-        if token.lemma_ in self.focus_tokens:
+        if token.lemma_.lower() in self.focus_tokens:
             return self.node_bias
 
         return self.default_bias
diff --git a/tests/test_biasedrank.py b/tests/test_biasedrank.py
index f6ee60d..f7785a7 100644
--- a/tests/test_biasedrank.py
+++ b/tests/test_biasedrank.py
@@ -31,6 +31,31 @@ def test_default_biased_rank (doc: Doc):
     assert tuple(p.text for p in phrases) == tuple(p.text for p in comparison_phrases)
 
 
+def test_focus_biased_rank (doc: Doc):
+    """
+Biasedrank should lead to different results from base textrank when focus is provided.
+    """
+    # given
+    biased_rank = BiasedTextRankFactory()
+    base_text_rank = BaseTextRankFactory()
+
+    # when
+    processed_doc = base_text_rank(doc)
+    phrases = processed_doc._.phrases
+
+    comparison_doc = biased_rank(doc)
+    tr = comparison_doc._.textrank
+    tr.change_focus(
+        "Manchester United",
+        bias=10.0,
+        default_bias=0.0)
+    comparison_phrases = comparison_doc._.phrases
+
+    # then
+    assert tuple(p.text for p in phrases[:3]) != tuple(p.text for p in comparison_phrases[:3])
+
+
+
 def test_biased_rank (long_doc: Doc):
     """
 Rank phrases close to 'focus' higher.