Let x0 of type ι be given.
Let x1 of type ι be given.
Apply unknownprop_604592dc5fe257d05bd9e42fd3eadcbb243b22bec35d240b4b58a45260f0d199 with
x0,
x1.
Apply unknownprop_e284d5f5a7c3a1c03631041619c4ddee06de72330506f5f6d9d6b18df929e48c with
Subq x0 x1.
The subproof is completed by applying H0.