Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Let x3 of type ι be given.
Apply unknownprop_19a146fddf3209a9cb9037b3c55d31c340ac02a53a93d51ec1e8262af3504478 with
x0,
λ x4 . x1,
x2,
x3 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.