{"id":"pairs-iff-even-counts","text":"An array can be divided into equal pairs if and only if every distinct element has an even frequency — the divide-array-into-equal-pairs solution checks `count % 2 == 0` for all Counter values.","truth_value":"IN","source":"entries/2026/06/06/divide-array-into-equal-pairs-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"pairs-iff-even-counts","truth_value":"IN","reason":"premise"}]}}