    New chain ID            Original chain ID

9sl4-pdb-bundle1.pdb:
           0                         0
           1                         1
           2                         2
           3                         3
           4                         4
           5                         5
           6                         6

9sl4-pdb-bundle2.pdb:
           A                         7
           B                         8
           C                         9
           D                         A
           E                        AA
           F                        AB
           G                        AC
           H                        AD
           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                         a
           i                         b
           j                         c
           k                         d
           l                         e
           m                         f
           n                         h
           o                         i
           p                         j
           q                         k
           r                         l
           s                         m
           t                         n
           u                         o
           v                         p
           w                         q
           x                         r
           y                         s
           z                         t
           0                         u
           1                         v
           2                         w
           3                         x
           4                         y
           5                         z
