Let x0 of type ι be given.
Apply unknownprop_47e9070ea3739d1ad8a468d330c2db6283d461493891f2d4e0f5d77f981e95d0 with
λ x1 x2 : ι → ο . x2 x0.
Apply unknownprop_389e2fb1855352fcc964ea44fe6723d7a1c2d512f04685300e3e97621725b977 with
atleast5 x0,
not (atleast6 x0) leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.