Apply unknownprop_f8517820c41e80abae5090668a4d7f9c31465f066f11281cc9990a74d008bfa1 with
λ x0 : ι → ι . λ x1 . x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 x1)))))))))))).
The subproof is completed by applying unknownprop_6f75760011b83dd62192f21bec4d99d5da7114ae04a9f9bfd52a18780ec3afb0.