    New chain ID            Original chain ID

6qcm-pdb-bundle1.pdb:
           A                        AB
           B                        BC
           C                        CB
           D                        DB
           E                        DC
           F                         E
           G                        EB
           H                         F
           I                        FA
           J                        FB
           K                        FC
           L                        GB
           M                        GC
           N                        HC
           O                        IB
           P                        IC
           Q                         K
           R                        KB
           S                         L
           T                        LB
           U                         M
           V                        OB
           W                         P
           X                        PB
           Y                         Q
           Z                        SB
           a                         T
           b                        TB
           c                         U
           d                        UB
           e                         V
           f                        VB
           g                         W
           h                         X
           i                         Y
           j                         Z
           k                         A
           l                         B
           m                         C
           n                         D
           o                         I
           p                         J
           q                         N
           r                         O
           s                         R
           t                         S
           u                         a
           v                         b
           w                         c
           x                         d
           y                         e
           z                         f
           0                         g
           1                         h
           2                         i
           3                         j
           4                        AD
           5                        CD
           6                        FD
           7                        HD
