Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Let x3 of type ι → ο be given.
Assume H0: x3 x0.
Assume H1: x3 x1.
Assume H2: x3 x2.
Let x4 of type ι be given.
Apply unknownprop_81da4a4b6c1b1603a521d080942fe6e652095cdddea7d0d491d4c44dcea723fa with
x0,
x1,
x2,
x4,
x3 leaving 4 subgoals.
The subproof is completed by applying H3.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H2.