1 2 3 4 5 6 7 8 9 10 11
1,user1,2013-01-04 1,user1,2013-01-04 1,user1,2013-01-04 1,user1,2013-01-04 2,user2,2013-01-05 2,user2,2013-01-05 3,user3,2013-01-06 4,user4,2013-01-07 4,user4,2013-01-07 4,user4,2013-01-07 4,user4,2013-01-07