    New chain ID            Original chain ID

9cpa-pdb-bundle1.pdb:
           l                         l
           C                         C
           E                         E
           G                         G
           I                         I
           J                         J
           K                         K
           L                         L
           N                         N
           P                         P
           X                         X
           Y                         Y
           Z                         Z
           a                         a
           c                         c
           i                         i
           2                         2
           F                         F
           H                         H
           M                         M
           O                         O
           S                         S
           T                         T
           V                         V
           W                         W
           d                         d
           e                         e
           f                         f
           g                         g
           n                         n
           U                         U
           R                         R
           D                         D
           y                         y
           q                         q
           r                         r
           s                         s
           t                         t
           u                         u
           1                         1

9cpa-pdb-bundle2.pdb:
           A                         A
           B                         B
           p                         p
           z                         z
           x                         x
           0                         0
           Q                         Q
           j                         j
           b                         b
           k                         k
           h                         h
