1003,1002,1002,1001
1004,1001,null,null
1004,1003,1003,1002
1005,1001,null,null
1005,1003,1003,1002
1005,1004,1004,1001
1005,1004,1004,1003
1003,1001,null,null
1004,1002,1002,1001
1004,1003,1003,1001
1005,1002,1002,1001
1005,1003,1003,1001
1005,1004,1004,1002
1002,1001,null,null