    New chain ID            Original chain ID

7asp-pdb-bundle1.pdb:
           Y                         Y
           X                         X
           3                         3
           A                         A
           B                         B
           2                         2
           4                         4
           a                         a
           b                         b
           c                         c
           C                         C
           d                         d

7asp-pdb-bundle2.pdb:
           D                         D
           E                         E
           e                         e
           f                         f
           g                         g
           G                         G
           H                         H
           h                         h
           I                         I
           i                         i
           j                         j
           J                         J
           k                         k
           K                         K
           L                         L
           l                         l
           m                         m
           M                         M
           n                         n
           N                         N
           o                         o
           O                         O
           p                         p
           P                         P
           q                         q
           Q                         Q
           R                         R
           S                         S
           T                         T
           U                         U
           V                         V
           W                         W
           1                         1
           Z                         Z
           F                         F
