    New chain ID            Original chain ID

9cdn-pdb-bundle1.pdb:
           A                         0
           B                         1
           C                         2
           D                         3
           E                         4
           F                         6
           G                         7
           H                         8
           I                         9
           J                         a
           K                         b
           L                         c
           M                         d
           N                         e
           O                         f
           P                         g
           Q                         h
           R                         i
           S                         j
           T                         k
           U                         m
           V                         n
           W                         o
           X                         p
           Y                         q
           Z                         r
           a                         B
           b                         C
           c                         D
           d                         E
           e                         F
           f                         H
           g                         I
           h                         J
           i                         K
           j                         L
           k                         N
           l                         O
           m                         P
           n                         Q
           o                         R
           p                         S
           q                         T
           r                         U
           s                         V
           t                         W
           u                         X
           v                         Y
           w                         Z
           x                         l
           y                         s
           z                         t
           0                         u
           1                         v
           2                         w
           3                         x
           4                         y
           5                         z
           6                         5
           7                         G
           8                         M
           9                        Ae

9cdn-pdb-bundle2.pdb:
           A                        Af
           B                        Aa
           C                        Ab
           D                        Ac
           E                        Ad
