fact: Variable b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 : bool.
imports: Coq(ssreflect ssrbool ssrfun Eqdep) mathcomp(ssrnat seq eqtype choice fintype) pcm(options axioms) Coq(Classes.Morphisms Program.Basics Program.Tactics) Coq(Relations)