Let x0 of type ι → ο be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Let x3 of type ι be given.
Apply unknownprop_2f012b836d2737bee8b0ea1a42f35a7284c53c0f3ff6d2b28adb72596ce6edb6 with
707bb.. x0,
4b3e1.. x0,
x1,
x2,
x3 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.