Section Arg12.
Variable gf : rel12 T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 -> rel12 T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11.
Arguments gf : clear implicits.

Theorem paco12_acc: forall
l r (OBG: forall rr (INC: r <12= rr) (CIH: l <12= rr), l <12= paco12 gf rr),
l <12= paco12 gf r.