    New chain ID            Original chain ID

6r6g-pdb-bundle1.pdb:
           A                         0
           B                         1
           C                         2
           D                         3
           E                         4
           F                         5
           G                         6
           H                         7
           I                         8
           J                         9
           K                         A
           L                        AA
           M                         B
           N                        BB
           O                         C

6r6g-pdb-bundle2.pdb:
           A                        CC
           B                        DD
           C                         D
           D                        EE
           E                         E
           F                        FF
           G                         F
           H                        GG
           I                         G
           J                         H
           K                        HH
           L                         I
           M                        II
           N                        JJ
           O                         J
           P                         K
           Q                        KK
           R                         L
           S                        LL
           T                         M
           U                        MM
           V                         N
           W                        NN
           X                         O
           Y                        OO
           Z                         P
           a                        PP
           b                         Q
           c                        QQ
           d                         R
           e                        RR
           f                         S
           g                        SS
           h                         T
           i                        TT
           j                        UU
           k                         U
           l                        VV
           m                         V
           n                         W
           o                        WW
           p                         X
           q                         Y
           r                         Z
           s                         a
           t                         b
           u                         c
           v                         d
           w                         e
           x                         f
           y                         g
           z                         h
           0                         i
           1                         j
           2                         k
           3                         l
           4                         m
           5                         n

6r6g-pdb-bundle3.pdb:
           A                         o
           B                         p
           C                         q
           D                         r
           E                         s
           F                         t
           G                         u
           H                         v
           I                         w
           J                         x
           K                         y
           L                         z
           M                        AB
           N                        AF
           O                        AC
           P                        AI
           Q                        AD
           R                        AE
           S                        AG
