Tue, 08 Feb 2000 22:28:30 +0100 (then_)tac: assert_backward;
wenzelm [Tue, 08 Feb 2000 22:28:30 +0100] rev 8213
(then_)tac: assert_backward;
(0) -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip