    New chain ID            Original chain ID

9o3o-pdb-bundle1.pdb:
           A                         A
           B                        AB
           C                         B
           D                        BB
           E                         C
           F                        CB
           G                         D
           H                        DB
           I                         E
           J                        EB
           K                         F
           L                        FB
           M                         G
           N                        GB
           O                         H
           P                        HB
           Q                         I
           R                        IB
           S                         J
           T                        JB
           U                         K
           V                        KB
           W                         L
           X                        LB
           Y                         M
           Z                        MB
           a                         N
           b                        NB
           c                         O
           d                        OB
           e                         P
           f                        PB
           g                         Q
           h                        QB
           i                         R
           j                        RB
           k                         S
           l                        SB
           m                         T
           n                        TB
           o                         a
           p                        ab
           q                         b
           r                        bb
           s                         c
           t                        cb
           u                         d
           v                        db
           w                         e
           x                        eb
           y                         f
           z                        fb
           0                         g
           1                        gb
           2                         h
           3                        hb
           4                         i
           5                        ib
           6                         j
           7                        jb
