Let x0 of type ι be given.
Let x1 of type ι → ο be given.
Let x2 of type ι → ο be given.
Apply unknownprop_46dd056036474c70cd94c7da1bc25abbf50dcb41b86cab7424c380fe7ecbda9d with
2c81e.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.