    New chain ID            Original chain ID

9x10-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        BA
           J                        BB
           K                        BC
           L                        BD
           M                        BE
           N                        BF
           O                        BG
           P                        BH
           Q                        BI
           R                        BJ
           S                        BK
           T                        BL
           U                        BM
           V                        BN
           W                        BO
           X                        BP
           Y                        CA
           Z                        CB
           a                        CC
           b                        CD
           c                        CE
           d                        CF
           e                        CG
           f                        CH
           g                        CI
           h                        CJ
           i                        CK
           j                        CL
           k                        CM
           l                        CN
           m                        CO
           n                        CP
           o                        DI
           p                        DJ
           q                        DK
           r                        DL
           s                        DM
           t                        DN
           u                        DO
           v                        DP
