Let x0 of type ι be given.
Let x1 of type ι → ι → ο be given.
Let x2 of type ι → ι → ο be given.
Apply unknownprop_1507a84cb42a4b39d3a7c60853b7977bf4f1b2181dfc290717d40d0cf4c8a9c0 with
08354.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.