Apply unknownprop_f8517820c41e80abae5090668a4d7f9c31465f066f11281cc9990a74d008bfa1 with
λ x0 : ι → ι . λ x1 . x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 (x0 x1))))))))).
The subproof is completed by applying unknownprop_127246c57adc93f5032e352a4463561387a9b3b9f04766e1c57313b7a93b14ff.