{"id":"valid-word-square-single-direction-sufficient","text":"Iterating only over existing characters in rows (not separately over columns) is sufficient to validate the word square because any extra column character at `(j, i)` would be caught when row `j` is iterated as the outer loop.","truth_value":"IN","source":"entries/2026/06/06/valid-word-square-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"valid-word-square-single-direction-sufficient","truth_value":"IN","reason":"premise"}]}}