    New chain ID            Original chain ID

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

9pra-pdb-bundle2.pdb:
           A                         A
           B                         c
           C                         p
           D                         s
           E                        OX
           F                         a
           G                        Ad
           H                        Ae
           I                        Af
           J                         B
