http://digfir-published.macmillanusa.com/cogtk/nine dot problem.html\t Chapter 1. Nine Dot Problem \t507863dbb11c0fcf42000000 http://digfir-published.macmillanusa.com/cogtk/nine dot problem_dlap.xml\tDLAP questions\t507863dbb11c0fcf42000000