Apply unknownprop_f8517820c41e80abae5090668a4d7f9c31465f066f11281cc9990a74d008bfa1 with
λ x0 : ι → ι . λ x1 . x0 (x0 (x0 (x0 (x0 (x0 x1))))).
The subproof is completed by applying unknownprop_d88f1786c40d73ebcad9492ae157666ffaa1a988fabe7b490c410a05ef1ea275.