    New chain ID            Original chain ID

8ipb-pdb-bundle1.pdb:
           A                        aa
           B                        ba
           C                        ca
           D                        da
           E                        ga
           F                        ha
           G                        ia
           H                        ja
           I                        ka
           J                        la
           K                        ma
           L                        na
           M                        oa
           N                        pa
           O                        qa
           P                        ra
           Q                        sa
           R                        ta
           S                        ua
           T                        va
           U                        wa
           V                        xa
           W                        ya
           X                        za
           Y                        bb
           Z                        cb
           a                        db
           b                        eb
           c                        fb
           d                        gb
           e                        hb
           f                        ib
           g                        AA
           h                        BA
           i                        CA
           j                        DA
           k                        EA
           l                        FA
           m                        GA
           n                        HA
           o                        IA
           p                        JA
           q                        KA
           r                        LA
           s                        MA
           t                        NA
           u                        OA
           v                        PA
           w                        QA
           x                        RA
           y                        SA
           z                        TA
           0                        UA
           1                        VA
           2                        WA
           3                        XA

8ipb-pdb-bundle2.pdb:
           A                        YA
           B                        ZA
           C                        AB
           D                        BB
           E                        CB
           F                        DB
           G                        EB
           H                        FB
           I                        GB
           J                        HB
           K                        IB
           L                        JB
           M                        KB
           N                        LB
           O                        MB
           P                        NB
           Q                        OB
           R                        PB
           S                        RB
           T                        SB
           U                        TB
           V                        al
           W                        cl
