    New chain ID            Original chain ID

6r7q-pdb-bundle1.pdb:
           A                        AA
           B                        BB
           C                        CC
           D                        DD
           E                        EE
           F                        FF
           G                        GG
           H                        HH
           I                        II
           J                        JJ
           K                        KK
           L                        LL
           M                        MM
           N                         0
           O                         1
           P                         2
           Q                         3
           R                         4
           S                         5
           T                         6
           U                         7

6r7q-pdb-bundle2.pdb:
           A                         8
           B                         9
           C                        NN
           D                        OO
           E                        PP
           F                        QQ
           G                        RR
           H                         A
           I                         B
           J                         C
           K                         D
           L                         E
           M                         F
           N                         G
           O                         H
           P                         I
           Q                         J
           R                         K
           S                         L
           T                         M
           U                         N
           V                         O
           W                         P
           X                         Q
           Y                         R
           Z                         S
           a                         T
           b                         U
           c                         V
           d                         W
           e                         X
           f                         Y
           g                         Z
           h                        SS
           i                         a
           j                         b
           k                         c
           l                         d
           m                         e
           n                         f
           o                         g
           p                         h
           q                         i
           r                         j
           s                         k
           t                         l
           u                         m
           v                         n
           w                         o
           x                         p
           y                         q

6r7q-pdb-bundle3.pdb:
           A                         r
           B                         s
           C                         t
           D                         u
           E                         v
           F                         w
           G                         x
           H                         y
           I                         z
           J                        TT
           K                        UU
           L                        VV
           M                        WW
           N                        XX
           O                        YY
           P                        ZZ
