Fri, 06 Jan 2012 10:19:48 +0100 haftmann prefer listsum over foldl plus 0
Fri, 06 Jan 2012 10:19:48 +0100 haftmann prefer concat over foldl append []
Fri, 06 Jan 2012 10:19:47 +0100 haftmann tuned proofs
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip