Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι → ι → ο be given.
Apply unknownprop_46c3efc739a178ed95a879a3b4a0a4dbf130b4b5be49c246fa54d4260f175d42 with
73737.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.