Let x0 of type ο be given.
Let x1 of type ο be given.
Let x2 of type ο be given.
Let x3 of type ο be given.
Assume H0: x1.
Apply unknownprop_7c688f24c3595bc4b513e911d7f551c8ccfedc804a6c15c02d25d01a2996aec6 with
or (or x0 x1) x2,
x3.
Apply unknownprop_55d33d10f6a09aaaea8e002117cf1820d9dc4418a57f04c18d4ec79694021a99 with
x0,
x1,
x2.
The subproof is completed by applying H0.