Let x0 of type ι be given.
Apply H0 with
struct_b x0.
Assume H2:
unpack_b_o x0 (λ x1 . λ x2 : ι → ι → ι . and (and (∃ x3 . and (x3 ∈ x1) (∀ x4 . x4 ∈ x1 ⟶ and (x2 x4 x3 = x4) (x2 x3 x4 = x4))) (∀ x3 . x3 ∈ x1 ⟶ bij x1 x1 (x2 x3))) (∀ x3 . x3 ∈ x1 ⟶ bij x1 x1 (λ x4 . x2 x4 x3))).
The subproof is completed by applying H1.
Apply unknownprop_5ef6db00f3c15a86c1e221d4a4c3ce606c4d873a1f90dd0b36114bf603c362c9 with
6e587...
The subproof is completed by applying L0.