    New chain ID            Original chain ID

5mrc-pdb-bundle1.pdb:
           A                         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                         0
           1                         1
           2                         2
           3                         3

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

5mrc-pdb-bundle3.pdb:
           A                        bb
           B                        cc
           C                        dd
