{"id":"no-shared-node-class","text":"Each solution directory defines its own `Node`/`TreeNode` class rather than importing from a shared module — tree structure definitions are duplicated per problem.","truth_value":"IN","source":"entries/2026/06/06/n-ary-tree-postorder-traversal-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"no-shared-node-class","truth_value":"IN","reason":"premise"}]}}