More S2 worked solutions

January 2008

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B2J1T-insOmpYTQ1ZjAzYjAtODliMy00ZWRlLTlkMjItNzk1OWNlODA0NmQz&hl=en_US

June 2007

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B2J1T-insOmpNWUwOTZjM2QtMWNkMy00YjVjLWI1ZDItMTQ0Mzc3YzQyMjQz&hl=en_US

January 2007

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B2J1T-insOmpNmFkYWFjNWItNTBkMS00NDZkLWIyNzMtN2VlNGQzMzFlYWQy&hl=en_US

June 2006

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B2J1T-insOmpMjAyMGE5NzMtNzhhZS00OTVhLWE2OTUtNWIwZmNlYTBiNzNj&hl=en_US

January 2006

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B2J1T-insOmpNGZlNGUxNTgtN2RhZS00ZjkxLWE3YmMtNWUxMzQwNDExZmQw&hl=en_US

June 2005

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B2J1T-insOmpN2IyNmFkMDYtNmMxOS00M2E3LWE4ZGMtMDcwZTE1ZTdkNWE5&hl=en_US

January 2005

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B2J1T-insOmpMGFkMzFhYzQtZmM3ZC00N2QxLThhYjItMWU4NzNlOTQ5NmRh&hl=en_US