1<booklist> 2<book category="S"> 3 <title>Number, the Language of Science</title> 4 <author>Danzig</author> 5</book> 6<book category="FC"> 7 <title>The Young Visiters</title> 8 <author>Daisy Ashford</author> 9</book> 10<book category="FC"> 11 <title>When We Were Very Young</title> 12 <author>A. A. Milne</author> 13</book> 14<book category="CS"> 15 <title>Design Patterns</title> 16 <author>Erich Gamma</author> 17 <author>Richard Helm</author> 18 <author>Ralph Johnson</author> 19 <author>John Vlissides</author> 20</book> 21</booklist> 22