Thu, 31 May 2007 23:47:38 +0200 wenzelm insert: canonical argument order;
Thu, 31 May 2007 23:47:36 +0200 wenzelm simplified/unified list fold;
(0) -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip