Let x0 of type ι → ο be given.
Let x1 of type ι → ι → ο be given.
Let x2 of type ι → ι → ο be given.
Let x3 of type ι be given.
Apply ax_mp with
wceq (x1 x3) (x2 x3) ⟶ wsbc (λ x4 . x0 x4) (x1 x3) ⟶ wsbc (λ x4 . x0 x4) (x2 x3),
wsbc (λ x4 . x0 x4) (x1 x3) ⟶ wceq (x1 x3) (x2 x3) ⟶ wsbc (λ x4 . x0 x4) (x2 x3) leaving 2 subgoals.
The subproof is completed by applying ax_frege52c with λ x4 . x0 x4, λ x4 . x1 x4, λ x4 . x2 x4, x3.
The subproof is completed by applying ax_frege8 with
wceq (x1 x3) (x2 x3),
wsbc (λ x4 . x0 x4) (x1 x3),
wsbc (λ x4 . x0 x4) (x2 x3).