Tue, 30 Mar 2010 15:46:50 -0700 simplify fold_graph proofs
huffman [Tue, 30 Mar 2010 15:46:50 -0700] rev 36045
simplify fold_graph proofs
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip