Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι be given.
Apply unknownprop_ffab984d2f508e18bfe310d5e5cd819bb21e8bf3764822cf852d36ccbf4924d7 with
8eacd.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.