Section Companion.
Variable gf: rel -> rel.
Hypothesis gf_mon: monotone6 gf.
Inductive cpn6 (r: rel) x0 x1 x2 x3 x4 x5 : Prop :=
| cpn6_intro
clo
(COM: compatible6 gf clo)
(CLO: clo r x0 x1 x2 x3 x4 x5)
.

Lemma cpn6_cpn r:
cpn6 (cpn6 r) <6= cpn6 r.