Let x0 of type ι be given.
Let x1 of type (ι → ο) → ο be given.
Let x2 of type ι → ι be given.
Let x3 of type ι → ο be given.
Apply unknownprop_c66e389e54bb7530ca5fe8d91115e62fdaa5d939b01fd7610f698850a21f5529 with
c7ccc.. x0 x1 x2 x3,
x0,
x1,
x2,
x3.
Let x4 of type ι → ι → ο be given.
The subproof is completed by applying H0.