Let x0 of type ι be given.
Apply unknownprop_ec8c619f83f9429c70e19b89b9f5ef3e81bf5475c75c603c03e9b710ef5b5a35 with
λ x1 x2 : ι → ο . x2 x0.
Apply unknownprop_389e2fb1855352fcc964ea44fe6723d7a1c2d512f04685300e3e97621725b977 with
atleast4 x0,
not (atleast5 x0) leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.