Apply unknownprop_18c079d0a948e2707cbd31a4293ae2dc77179c2184f0225dd81bf201082f253d with
u17_to_Church17,
u5,
λ x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15 x16 . x5.
The subproof is completed by applying unknownprop_f461f6307e5b20daa015b84851f5184465ff9172f77eba9ec16a3597df2b2e3b.