lab4

http://s9826145.blogspot.com/2011/02/blog-post.html?showComment=1298290595925#c640956455451420297

http://s9726342.blogspot.com/2011/02/homework-1.html?showComment=1298291363819#c8222846668038528407


http://s9726324.blogspot.com/2011/02/hw1.html?showComment=1298291664679#c1509139238021335429

http://s9726322.blogspot.com/2011/02/homework1.html?showComment=1298291864288#c6983222422226771317


http://s9726325.blogspot.com/2011/02/homework1.html?showComment=1298292099191#c6053387121775409282