Let x0 of type ι be given.
Let x1 of type ι be given.
Apply unknownprop_a23ec6a55ac212526d74cbf0d04096929ad453b0eb0f8023e32b8a33930d39fb with
binunion x0 x1,
binunion x1 x0 leaving 2 subgoals.
The subproof is completed by applying unknownprop_89778e516e7ebf1a324f6af9663fa4302fc206704f52147dd7db72722a674190 with x0, x1.
The subproof is completed by applying unknownprop_89778e516e7ebf1a324f6af9663fa4302fc206704f52147dd7db72722a674190 with x1, x0.