Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι → ι → ο be given.
Apply unknownprop_8daea0012d7bb512adb4f48dbebfa53a75ffb67bf8ee27eb9244a48352449fb2 with
73737.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.