Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι → ι → ι be given.
Let x3 of type ι → ι → ι be given.
Let x4 of type ι be given.
Assume H0:
x0 = e707a.. x1 x2 x3 x4.
Apply H0 with
λ x5 x6 . x1 = f482f.. x6 4a7ef...
Let x5 of type ι → ι → ο be given.
The subproof is completed by applying unknownprop_420bb7efe76e1c91456fb5a55a5e3a5b5429f25f8f9d624532ab60a858f918e6 with
x1,
eb53d.. x1 x2,
eb53d.. x1 x3,
x4,
λ x6 x7 . x5 x7 x6.