def c4.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
98def c4.c(
99 +a: Bool, +b: Bool, +c: Bool, +d: Bool,
100 e: {Bool.and(Bool.and(Bool.and(a, b), c), d) == True{} : Bool}
101) -> {c == True{} : Bool}:
102 MBool.eq_true_of_and_right(Bool.and(a, b), c, MBool.eq_true_of_and_left(Bool.and(Bool.and(a, b), c), d, e))