{"id":"valid-word-hyphen-boundary-safe","text":"The hyphen validation in `is_valid` checks `i == 0 or i == len(token) - 1` and returns `False` before accessing `token[i-1]` or `token[i+1]`, guaranteeing no `IndexError`","truth_value":"IN","source":"entries/2026/06/06/number-of-valid-words-in-a-sentence-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"valid-word-hyphen-boundary-safe","truth_value":"IN","reason":"premise"}]}}