destruct q as [[[? ?] ?] ?]. destruct q0 as [[[? ?] ?] ?].
destruct q1 as [[[? ?] ?] ?]. destruct q2 as [[[? ?] ?] ?]. simpl.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity.
destruct i. eexists; reflexivity. omega.
Qed.

Lemma QuadWordRepI_length s: length (QuadWordRepI s) = 4%nat.