    New chain ID            Original chain ID

6x64-pdb-bundle1.pdb:
           A                        AV
           B                        AW
           C                        BV
           D                        BW
           E                        CV
           F                        CW
           G                        DV
           H                        DW
           I                        EV
           J                        EW
           K                        FV
           L                        FW
           M                        GV
           N                        GW
           O                        HV
           P                        HW
           Q                        IV
           R                        IW
           S                        JV
           T                        JW
           U                        KV
           V                        KW
           W                        LV
           X                        LW
           Y                        MV
           Z                        MW
           a                        NV
           b                        NW
           c                        OV
           d                        OW
           e                        PV
           f                        PW
           g                        QV
           h                        QW
           i                        RV
           j                        RW
