Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι → ι be given.
Let x3 of type ι be given.
Apply unknownprop_860ef8aa77a7ae3d2d46999c9ef185eebbc09dd8a4461c8ad597663a40687f92 with
5f184.. x0 x1 x2 x3,
x0,
x1,
x2,
x3.
Let x4 of type ι → ι → ο be given.
The subproof is completed by applying H0.