Let x0 of type ι be given.
Let x1 of type ι → ο be given.
Let x2 of type ι → ι be given.
Let x3 of type ι be given.
Assume H0: x3 ∈ x0.
Assume H1: x1 x3.
Apply ReplI with
Sep x0 x1,
x2,
x3.
Apply SepI with
x0,
x1,
x3 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.