{"id":"pairwise-inequality-for-fixed-window","text":"For the size-3 sliding window, three explicit pairwise `!=` checks are used instead of `len(set(window)) == 3` — a micro-optimization that avoids set construction","truth_value":"IN","source":"entries/2026/06/06/substrings-of-size-three-with-distinct-characters-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"pairwise-inequality-for-fixed-window","truth_value":"IN","reason":"premise"}]}}