Let x0 of type ι be given.
Apply unknownprop_8da13791b7dd1ebf2304410ec45eba97dfe397ef11526a77be93821c0ea7f214 with
x0,
x0 = ad280.. (28f8d.. x0) (d634d.. x0) leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H2.