    New chain ID            Original chain ID

8rto-pdb-bundle1.pdb:
           A                       AAA
           B                       BBB
           C                       CCC
           D                       DDD
           E                       AeA
           F                       AhA
           G                       BeB
           H                       BhB
           I                       CeC
           J                       CgC
           K                       DeD
           L                       DgD
