Apply unknownprop_e9ef755431cb760bbf47dc0630cd74e38be1fffa1f9d7eecd713121223b57312 with
λ x0 x1 x2 . bc82c.. x0 (bc82c.. x1 x2) = bc82c.. (bc82c.. x0 x1) x2.
Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Apply unknownprop_b2d3cb96a6a882d02e5e57dcfc02559b580d1f8621959f82afe70dc68a4b010f with
x0,
bc82c.. x1 x2,
λ x3 x4 . x4 = bc82c.. (bc82c.. x0 x1) x2 leaving 3 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying L11.