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Update instructions.md #1026

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Update instructions.md #1026

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6 changes: 3 additions & 3 deletions exercises/practice/nucleotide-count/.docs/instructions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,11 +13,11 @@ We represent a DNA sequence as an ordered collection of these four nucleotides a
'A' for adenine, 'C' for cytosine, 'G' for guanine, and 'T' for thymine.

Given a string representing a DNA sequence, count how many of each nucleotide is present.
If the string contains characters that aren't A, C, G, or T then it is invalid and you should signal an error.
If the string contains characters that aren't A, C, G, or T then it is invalid.

For example:

```text
"GATTACA" -> 'A': 3, 'C': 1, 'G': 1, 'T': 2
"INVALID" -> error
"GATTACA" -> "A:3 C:1 G:1 T:2"
"INVALID" -> ""
```