    New chain ID            Original chain ID

9sl6-pdb-bundle1.pdb:
           0                         0
           1                         1
           2                         2
           3                         3
           4                         4
           5                         5
           6                         6

9sl6-pdb-bundle2.pdb:
           A                         7
           B                         8
           C                         9
           D                         A
           E                        AA
           F                        AB
           G                        AC
           H                        AD
           I                        AE
           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
           Z                         R
           a                         S
           b                         T
           c                         U
           d                         V
           e                         W
           f                         X
           g                         Y
           h                         Z
           i                         a
           j                         b
           k                         c
           l                         d
           m                         e
           n                         f
           o                         h
           p                         i
           q                         j
           r                         k
           s                         l
           t                         m
           u                         n
           v                         o
           w                         p
           x                         q
           y                         r
           z                         s
           0                         t
           1                         u
           2                         v
           3                         w
           4                         x
           5                         y
           6                         z
