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Implement duplicates removed equivalently to the reference

Implement duplicates removed equivalently to the reference: a task in repo2rlenv-equivalence-tests (Harbor dataset). Implement the function duplicates removed in /workspace/task module.py so that it is behaviorally equivalent to reference duplicates removed (which is already provided in task…

The task

Implement the function `duplicates_removed` in `/workspace/task_module.py` so that it is behaviorally equivalent to `reference_duplicates_removed` (which is already provided in `task_module.py`).

Part of FineEnvs/repo2rlenv-equivalence-tests.