Let x0 of type ι be given.
Let x1 of type ι be given.
Apply unknownprop_9bcd3ca68066c7069c00444b0b53fe3ae6267cb29974000b72e5fe8327360c0b with
e4431.. x0,
e4431.. x1,
λ x2 . prim1 x2 x0,
λ x2 . prim1 x2 x1 leaving 3 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H2.