Status: IN
Helper functions nested inside solution methods (e.g., `is_valid` in `countValidWords`, `diff` in `stringWithDifferentDifference`) don't capture mutable state from the enclosing scope — they are pure functions co-located for readability
Source: entries/2026/06/06/number-of-valid-words-in-a-sentence-solution.md, entries/2026/06/06/odd-string-difference-solution.md
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