diff --git a/MonsterRegularExpression_NANPA_formats.cs b/MonsterRegularExpression_NANPA_formats.cs
index f70ab25..108a4b3 100644
--- a/MonsterRegularExpression_NANPA_formats.cs
+++ b/MonsterRegularExpression_NANPA_formats.cs
@@ -14,7 +14,7 @@ class TelephoneFormatDetection
 {
     string NANPAFormat =
         "(^" +
-        "(?<ERC>(811|[0-79](11|22|33|44|55|66|66|88|99)))|" +
+        "(?<ERC>(811|[0-79](11|22|33|44|55|66|77|88|99)))|" +
         "(?<ReservedAreaCode>([2-9]9[0-9])|(37|96)[0-9])"
         "(?<NonGeoSvc>(5(00|2[1-9][0-9]33|44|55|66|77|88|99)))|" +
         "(?<CASvc>(6(00|22)))|" +
@@ -27,6 +27,6 @@ class TelephoneFormatDetection
             "(?<Triple5Exchg>(555))-(?<EntertainNum>(01[0-9]{2}))|(?<InfoNum>(1212|4334))|(?<AssngNum>(0[2-9]){2}|[1-9][0-9]{2})|(?<Exchange>[2-9][0-9]{1})-(?<Number>[0-9]{3})"
         ")$";
     
-    string oneliner = "(^(?<ERC>(811|[0-79](11|22|33|44|55|66|66|88|99)))|(?<ReservedAreaCode>([2-9]9[0-9])|(37|96)[0-9])|(?<NonGeoSvc>(5(00|2[1-9][0-9]33|44|55|66|77|88|99)))|(?<CASvc>(6(00|22)))|(?<InterExch>(700))|(?<USGovt>(710))|(?<TollFree>8(00|33|44|55|66|77|88))|(?<Premium>(900))(?<AreaCode>([2-9][0-8])[0-9])-(?<Triple5Exchg>(555))-(?<EntertainNum>(01[0-9]{2}))|(?<InfoNum>(1212|4334))|(?<AssngNum>(0[2-9]){2}|[1-9][0-9]{2})|(?<Exchange>[2-9][0-9]{1})-(?<Number>[0-9]{3})")$";
+    string oneliner = "(^(?<ERC>(811|[0-79](11|22|33|44|55|66|77|88|99)))|(?<ReservedAreaCode>([2-9]9[0-9])|(37|96)[0-9])|(?<NonGeoSvc>(5(00|2[1-9][0-9]33|44|55|66|77|88|99)))|(?<CASvc>(6(00|22)))|(?<InterExch>(700))|(?<USGovt>(710))|(?<TollFree>8(00|33|44|55|66|77|88))|(?<Premium>(900))(?<AreaCode>([2-9][0-8])[0-9])-(?<Triple5Exchg>(555))-(?<EntertainNum>(01[0-9]{2}))|(?<InfoNum>(1212|4334))|(?<AssngNum>(0[2-9]){2}|[1-9][0-9]{2})|(?<Exchange>[2-9][0-9]{1})-(?<Number>[0-9]{3})")$";
         
 }