Let x0 of type ι be given.
Let x1 of type ι → ι → ο be given.
Apply unknownprop_1fa9c9d00efe90036353b59fc1d702447ec906288bf6c4ad9112a2912900686a with
35983.. x0 x1,
x0,
x1.
Let x2 of type ι → ι → ο be given.
The subproof is completed by applying H0.