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+- **Added:**
+ Extend some list lemmas to both directions: `app_inj_tail_iff`, `app_inv_head_iff`, `app_inv_tail_iff`.
+ (`#12094 <https://github.com/coq/coq/pull/12094>`_,
+ fixes `#12093 <https://github.com/coq/coq/issues/12093>`_,
+ by Edward Wang).