When I developed this I did away with those tiles which had multiple segments first. Ultimately I did have to resort to extra tiles which is the reason for the phrase: "used at least once". My layout came in with 16 tiles.
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
re(3): Thoughts on notation etc
