Mon, 05 Jan 2009 15:26:57 -0800 use Thm.close_derivation instead of standard
huffman [Mon, 05 Jan 2009 15:26:57 -0800] rev 29371
use Thm.close_derivation instead of standard
(0) -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip