    New chain ID            Original chain ID

7tnt-pdb-bundle1.pdb:
           A                        2A
           B                        2B
           C                        2C
           D                        2D
           E                        2E
           F                        2F
           G                        2G
           H                        2H
           I                        2I
           J                        3A
           K                        3B
           L                        3C
           M                        3D
           N                        3E
           O                        3F
           P                        3G
           Q                        3H
           R                        3I
           S                        4A
           T                        4B
           U                        4C
           V                        4D
           W                        4E
           X                        4F
           Y                        4G
           Z                        4H
           a                        4I
           b                        5A
           c                        5B
           d                        5C

7tnt-pdb-bundle2.pdb:
           A                        5D
           B                        5E
           C                        5F
           D                        5G
           E                        5H
           F                        5I
