{"id":"dummy-head-sentinel-pattern","text":"`remove_elements` and `from_list` both use a dummy sentinel node (`ListNode(next=head)`) so that operations at the head position require no special-case branching — this pattern recurs across linked list solutions in the repo.","truth_value":"IN","source":"entries/2026/06/06/remove-linked-list-elements-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"dummy-head-sentinel-pattern","truth_value":"IN","reason":"premise"}]}}