Let x0 of type ο be given.
Apply H0 with
pack_u 1 (λ x1 . 0).
Let x1 of type ο be given.
Apply H1 with
λ x2 . lam (ap x2 0) (λ x3 . 0).
Let x2 of type ο be given.
Apply H2 with
pack_u omega (λ x3 . x3).
Let x3 of type ο be given.
Apply H3 with
lam 1 (λ x4 . 0).
Let x4 of type ο be given.