I can't find any references offhand, but they're on the back of section 1. And I'm going absolutely crazy over it. Maybe it's because I've been up for 24 hours, or maybe I've suddenly become daft, because I can't complete more than one number (for example get all 1s placed). After that I'm unable to figure out where to put anything else )  14:37, 20 Jun 2005 (UTC)