Apply unknownprop_18c079d0a948e2707cbd31a4293ae2dc77179c2184f0225dd81bf201082f253d with
u17_to_Church17,
u13,
λ x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15 x16 . x13.
The subproof is completed by applying unknownprop_03e2017d284d64a9fcf46d0d4f1a895df5d505e46d376bc276e5515bb0b193fb.