Wed, 17 Mar 1999 17:20:36 +0100 wenzelm Theory.sign_of;
Wed, 17 Mar 1999 17:19:18 +0100 wenzelm xnum token class;
Wed, 17 Mar 1999 17:18:54 +0100 wenzelm xstr token class;
(0) -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip