{A B : Type} (C : B -> Type) (f : A -> B) `{forall b, Contr (C b)} : ooExtendableAlong f C := fun n => extendable_contr n C f.
Require Import HoTT.Basics HoTT.Types. Require Import Equiv.PathSplit Homotopy.IdentitySystems. Require Import Cubical.DPath Cubical.DPathSquare. Require Import Colimits.Coeq Colimits.MappingCylinder.