----- MACE 2.2, August 2003 ----- The process was started by mccune on gyro.thornwood, Tue Aug 19 14:47:15 2003 The command was "../../bin/mace2 -N10 -p". op(700,xfx,<<). formula_list(usable). all x exists y (x< -(y< (exists z (x< usable clausifies to: list(usable). 1 [] x<<$f1(x). 2 [] -(x<