Name: a.txt
Lines: 3
Buflen: 53
1:1:17:1  XXXXXXXXXXXXXXXXXXXX
2:18:1:2                177583
3:19:52:3  XXXXXXXXXXXXXXXXXXXX

Name: b.txt
Lines: 3
Buflen: 53
1:1:17:1  XXXXXXXXXXXXXXXXXXXX
2:18:1:2                177583
3:19:52:3  XXXXXXXXXXXXXXXXXXXX

