    New chain ID            Original chain ID

5mrc_1-pdb-bundle1.pdb:
           A                         B
           B                         C
           C                         D
           D                         E
           E                         F
           F                         G
           G                         H
           H                         I
           I                         J
           J                         K
           K                         L
           L                         M
           M                         N
           N                         O
           O                         P
           P                         Q
           Q                         R
           R                         S
           S                         T
           T                         U
           U                         V
           V                         W
           W                         X
           X                         Y
           Y                         Z
           Z                         0
           a                         1
           b                         2
           c                         3
           d                         4
           e                         5
           f                         6
           g                         7
           h                         8
           i                         9
           j                         a
           k                         b
           l                         c
           m                         d
           n                        AA
           o                        BB
           p                        CC
           q                        DD
           r                        EE
           s                        FF
           t                        GG
           u                        HH
           v                        II
           w                        JJ
           x                        KK
           y                        LL
           z                        MM
           0                        NN
           1                        OO
           2                        PP
           3                        QQ
           4                        RR
           5                        SS
           6                        TT
           7                        UU
           8                        VV
           9                        WW
5mrc_1-pdb-bundle2.pdb:
           A                        XX
           B                        YY
           C                        ZZ
           D                        11
           E                        22
           F                        33
           G                        44
5mrc_1-pdb-bundle3.pdb:
           A                        44
           B                        55
           C                        66
           D                        77
           E                        88
           F                        cc
           G                        dd
