Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply unknownprop_eb8e8f72a91f1b934993d4cb19c84c8270f73a3626f3022b683d960a7fef89cb with
nIn x2 x0,
nIn x2 x1.
Apply unknownprop_940dea6a35086bcfb43d0f30690508b300df03ae4db6b7bda9152346013c00c5 with
x0,
x1,
x2.
The subproof is completed by applying H0.