Definition squash_unsquash := K.squash_unsquash.Definition unsquash_squash := K.unsquash_squash.Definition knot_age1 := K.knot_age1.Definition knot_level := K.knot_level.Module K := K'.

Lemma unsquash_inj : forall k1 k2, unsquash k1 = unsquash k2 -> k1 = k2.