Let x0 of type ι be given.
Apply unknownprop_fe7ff313be3d0b9f2334c12982636aff94f7603137e8053506a95c79965309c2 with
setminus 0 x0.
Let x1 of type ι be given.
Apply unknownprop_b30a94f49240f0717f4ecb200a605aa8a4e6dad6dc5d1afa60c37866ee96baab with
x1,
setminus 0 x0.
Apply unknownprop_1cc88f7e87aaf8c5cee24b4a69ff535a81e7855c45a9fd971eec05ee4cc28f9c with
x1.
Apply unknownprop_29bb348fa91dd336b68009f32eb9809a20ab7c7920c130047ad13aae3b335ac5 with
0,
x0,
x1.
The subproof is completed by applying H0.