Apply unknownprop_abe15cc9bd131c95b0b9585b43caa22ca6fcee57a092fd0cd1b55cd95e75595e with
λ x0 x1 : ι → ι → ι . ∀ x2 . ∀ x3 : ι → ι . ∀ x4 : ι → ι → ι . ∀ x5 . In x5 x2 ⟶ ∀ x6 . In x6 (x3 x5) ⟶ ∀ x7 . In x7 (x4 x5 x6) ⟶ In (x0 x5 (x0 x6 x7)) (lam2 x2 x3 x4).
The subproof is completed by applying unknownprop_397305affede3e15fa2061710fe0bd933293d2a0c755ed15b8749cd73ba5378e.