    New chain ID            Original chain ID

9x1e-pdb-bundle1.pdb:
           A                        AA
           B                        CC
           C                        CD
           D                        CG
           E                        CH
           F                        CI
           G                        CJ
           H                        DA
           I                        DB
           J                        DC
           K                        DD
           L                        DG
           M                        DH
           N                        DI
           O                        DJ
           P                        EA
           Q                        EB
           R                        EC
           S                        ED
           T                        AB
           U                        EG
           V                        EH
           W                        EI
           X                        EJ
           Y                        FA
           Z                        FB
           a                        FC
           b                        FD
           c                        FG
           d                        FH
           e                        FI
           f                        FJ
           g                        GA
           h                        GB
           i                        GC
           j                        GD
           k                        AC
           l                        GG
           m                        GH
           n                        GI
           o                        GJ
           p                        AD
           q                        AG
           r                        AH
           s                        AI
           t                        AJ
           u                        BA
           v                        BB
           w                        BC
           x                        BD
           y                        BG
           z                        BH
           0                        BI

9x1e-pdb-bundle2.pdb:
           A                        BJ
           B                        CA
           C                        CB
