Word description To collectively register a plurality of callbacks.
Examples
LOGIC-PREDS: N_>_0 N2_is_N_-_1 F_is_F2_*_N ;
{
{ { N_>_0 N } [ N of 0 > ] }
{ N2_is_N_-_1 N2 N } [ dup N of 1 - N2 unify ] }
{ F_is_F2_*_N F F2 N } [ dup [ F2 of ] [ N of ] bi * F unify ] }
} callbacks