lab#4

1.
http://s9726335.blogspot.com/2011/02/homework-1.html?showComment=1298290702872#c8101534705302016517

2.
http://s9726317--z200074630.blogspot.com/2011/02/homework-1.html?showComment=1298291169138#c6843499277268856181

3.
http://s9726303.blogspot.com/2011/02/homework-1.html?showComment=1298291731507#c6742574305058041004

4.
http://s9726305.blogspot.com/2011/02/homework-1.html?showComment=1298291941171#c5536241645663604770

5.
http://s9726348.blogspot.com/2011/02/homework-1.html