8148 /www/nrich/html/content/id/8148/ 10 2012-10-31T15:28:33 <?xml version="1.0" encoding="UTF-8"?> <mdoxml version="1.0"><h4>Scroll down to see our complete collection of problems that require students to work systematically, or explore the two sub-collections focussing on important aspects of systematic working.<br></br>  </h4></mdoxml> 2 0 0 0 1 0 0 7496 Header