Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Let x3 of type ι be given.
Apply unknownprop_3647185bee823f297472e9b1979bff6804bdede7c0824747eee03864f4f342a6 with
λ x4 x5 : ι → ι → ι → ο . x5 x0 x2 x3 ⟶ x5 x1 x2 x3.
Apply unknownprop_385a349774bd141f67c9640b600008e8534ed0c05d891557fd37870b1d687d7f with
λ x4 . In x4 x2,
λ x4 . In x4 x3,
x0,
x1 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.