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_fold: forall r,
gf (upaco12 gf r) <12== paco12 gf r.