lab7

1. http://s9726311.blogspot.com/2011/09/homework-9-26-2011.html?showComment=1317643789427#c6967049671306164846
2.  http://s9826266.blogspot.com/2011/09/homework-9-26-2011.html?showComment=1317643974261#c241720616823523625
3. http://s9726121.blogspot.com/2011/10/hw-9-26.html?showComment=1317644090115#c8953134342955248181
4. http://s9726316.blogspot.com/2011/10/homework-9-26-2011.html?showComment=1317644188530#c5419804867886641439
5. http://s9726141.blogspot.com/2011/09/homework-9-26-2011.html?showComment=1317644258162#c1345824025840396573