Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply unknownprop_1a4eea2e7e2053f757a088192061db01d519464057770f62e2fa414ed5ef28ac with
x1,
x2,
λ x3 . x0 leaving 2 subgoals.
The subproof is completed by applying H1.
Let x3 of type ι be given.
The subproof is completed by applying H0.