Let x0 of type ι be given.
Let x1 of type ι → ι → ο be given.
Let x2 of type ι → ο be given.
Apply unknownprop_a0c1cfbe827e15400df973a6e68533df2c6a861774fe22bb87a9ee4680d54108 with
42836.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.