Let x0 of type ο be given.
Apply unknownprop_1e0cb2b8ae8b2a70437458035764f08e7eaba30fc84a0048f28b1466366514c4 with
or x0 (not x0).
Apply unknownprop_e284d5f5a7c3a1c03631041619c4ddee06de72330506f5f6d9d6b18df929e48c with
not (or x0 (not x0)).
Apply notE with
or x0 (not x0).
The subproof is completed by applying H0.
Apply L1.
Apply unknownprop_c29620ea10188dd8ed7659bc2875dc8e08f16ffd29713f8ee3146f02f9828ceb with
x0,
not x0.
Apply unknownprop_e284d5f5a7c3a1c03631041619c4ddee06de72330506f5f6d9d6b18df929e48c with
x0.
Assume H2: x0.
Apply L1.
Apply unknownprop_7c688f24c3595bc4b513e911d7f551c8ccfedc804a6c15c02d25d01a2996aec6 with
x0,
not x0.
The subproof is completed by applying H2.