    New chain ID            Original chain ID

6yw5-pdb-bundle1.pdb:
           A                        AA
           B                        BB
           C                        CC
           D                        DD
           E                        EE
           F                        FF
           G                        GG
           H                        HH
           I                        II
           J                        JJ
           K                        KK
           L                        LL
           M                        MM
           N                        NN
           O                        OO
           P                        PP
           Q                        QQ
           R                        RR
           S                        SS
           T                        TT
           U                        UU
           V                        VV
           W                        WW
           X                        XX
           Y                        YY
           Z                        ZZ
           a                        11
           b                        22
           c                        33

6yw5-pdb-bundle2.pdb:
           A                        44
           B                        55
           C                        66
           D                        77
           E                        88
           F                        00
           G                        99
           H                        aa
           I                         V
