{"id":"lonely-detection-xor-logic","text":"A child is appended to lonely-node results if and only if exactly one of `(left, right)` exists at the parent — a logical XOR on child presence, implemented via `if`/`elif` branches.","truth_value":"IN","source":"entries/2026/06/06/find-all-the-lonely-nodes-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"lonely-detection-xor-logic","truth_value":"IN","reason":"premise"}]}}