Let x0 of type ι be given.
Let x1 of type ι → ι → ι be given.
Let x2 of type ι → ι → ι be given.
Let x3 of type ι → ι → ο be given.
Let x4 of type ι be given.
Let x5 of type ι be given.
Apply pack_b_b_r_e_e_5_eq with
pack_b_b_r_e_e x0 x1 x2 x3 x4 x5,
x0,
x1,
x2,
x3,
x4,
x5.
Let x6 of type ι → ι → ο be given.
The subproof is completed by applying H0.