fact: Definition not_all_ex_not_rel4 := λ"f" callcc @ (λ"g" "f" @ (λ"r₁" λ"r₂" λ"r₃" λ"r₄" callcc @ (λ"h" "g" @ (λ"i" "i" @ "r₁" @ "r₂" @ "r₃" @ "r₄" @ "h")))).
imports: ClassicalRealizability.Tactics ClassicalRealizability.BasicResults ClassicalRealizability.Subtyping