so that the enlarged tile AL decomposes into two AL tiles and one AS tiles. The matching rules force a particular substitution: the two AL tiles in a AL tile must form a kite, and thus a kite decomposes into two kites and a two half-darts, and a dart decomposes into a kite and two half-darts. Enlarged B-tiles decompose into B-tiles in a similar way (via A-tiles).
