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From Coq Require Import ssreflect ssrfun ssrbool.
From mathcomp Require Import eqtype seq tuple.
Set Implicit Arguments.
Unset Strict Implicit.
Unset Printing Implicit Defensive.
Definition trev T n (t : n.-tuple T) := [tuple of rev t].
Lemma trevK T n : involutive (@trev T n).
Proof. by move=>t; apply: val_inj; rewrite /= revK. Qed.
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