    New chain ID            Original chain ID

7rmf-pdb-bundle1.pdb:
           W                         W
           B                         B
           C                         C
           A                         A
           J                         J
           F                         F
           H                         H
           D                         D
           K                         K
           G                         G
           I                         I

7rmf-pdb-bundle2.pdb:
           E                         E
