Let x0 of type ι be given.
Let x1 of type ι → ι → ι be given.
Let x2 of type ι → ι → ο be given.
Apply unknownprop_b07ec66b2c1458d9e0beb632cfd4e0a883d9ca03da44da159eabdc44b6098dca with
b5cc3.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.