def c3.c
import bend-kit-collections@0.1.4.1/PROOF.bend as PROOFimport Base
import bend-mathlib@0.7.4.0/bool.bend as MBool
123def c3.c(+a: Bool, +b: Bool, +c: Bool, e: {Bool.and(Bool.and(a, b), c) == True{} : Bool}) -> {c == True{} : Bool}:
124 MBool.eq_true_of_and_right(Bool.and(a, b), c, e)