Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι be given.
Apply unknownprop_2769d6d05b4c29e61a26ed4101420d229b33e9f0b5567033807a1f0c095c092d with
8eacd.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.