Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι be given.
Let x3 of type ι be given.
Apply unknownprop_7e986439242ce85fa04e4b7be2035418e9dbee6641ed66c6c5b7be52a2254fca with
x2,
x3,
λ x4 x5 . prim1 x4 x0.
Apply unknownprop_98f3c840cba6bdce01722164c49b9631757b7c90bc7c46b34a7200f5fcc911e5 with
x0,
x1,
aae7a.. x2 x3.
The subproof is completed by applying H0.