    New chain ID            Original chain ID

9sl7-pdb-bundle1.pdb:
           0                         0
           1                         1
           2                         2
           3                         3
           4                         4
           5                         5
           6                         6

9sl7-pdb-bundle2.pdb:
           A                         7
           B                         8
           C                         9
           D                         A
           E                        AA
           F                        AB
           G                        AC
           H                        AD
           I                        AE
           J                        AF
           K                         B
           L                         C
           M                         D
           N                         E
           O                         F
           P                         G
           Q                         H
           R                         I
           S                         J
           T                         K
           U                         L
           V                         M
           W                         N
           X                         O
           Y                         P
           Z                         Q
           a                         R
           b                         S
           c                         T
           d                         U
           e                         V
           f                         W
           g                         X
           h                         Y
           i                         Z
           j                         a
           k                         b
           l                         c
           m                         d
           n                         e
           o                         f
           p                         h
           q                         i
           r                         j
           s                         k
           t                         l
           u                         m
           v                         n
           w                         o
           x                         p
           y                         q
           z                         r
           0                         s
           1                         t
           2                         u
           3                         v
           4                         w
           5                         x
           6                         y
           7                         z
