fact: Definition cate_prod_twist (x y z : A) : cat_prod x (cat_prod y z) $<~> cat_prod y (cat_prod x z).
imports: Basics EquivGpd Types.Prod WildCat.Core WildCat.ZeroGroupoid WildCat.Equiv WildCat.Yoneda WildCat.Universe WildCat.NatTrans WildCat.Opposite