file5	1
file5	1
file5	1
file2	1
file4	1
file3	1
file3	2
file4	2
file1	2
file1	3
file4	3
file2	3
file5	3
file5	3
file2	4
file1	4
file3	4
file3	5
file1	5
file2	5
file4	5
file4	6
file2	6
file1	6
file3	6
file5	6
file5	6
file5	7
file3	7
file1	7
file2	7
file4	7
file4	8
file2	8
file1	8
file3	8
