Let x0 of type ι be given.
Let x1 of type (ι → ο) → ο be given.
Let x2 of type ι → ο be given.
Apply unknownprop_acd8f43b38bbfc56d90d3b8e0e9b1b110233608fc0986e6b6548f73d0deaecdd with
01d88.. x0 x1 x2,
x0,
x1,
x2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H0.