Mon, 08 Aug 2011 10:32:55 -0700 huffman rename Pair_fst_snd_eq to prod_eq_iff (keeping old name too)
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip