fact: Definition I2_λ : lambda 0 := abs (abs (app (var (make_stn 2 0 (idpath true))) (var (make_stn 2 1 (idpath true))))).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Combinatorics.Tuples UniMath.Combinatorics.Vectors UniMath.Combinatorics.StandardFiniteSets UniMath.AlgebraicTheories.LambdaCalculus