    New chain ID            Original chain ID

6vwl-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         I
           I                         J
           J                         K
           K                         L
           L                         M
           M                         N
           N                         O
           O                         P
           P                         Q
           Q                         R
           R                         S
           S                         T
           T                         U
           U                         V
           V                         W
           W                         X
           X                         Y
           Y                         Z
           Z                        AA
           a                        AB
           b                         3
           c                         5
           d                        AC
           e                         2
           f                         a
           g                         b
           h                         c
           i                         d
           j                         e
           k                         f
           l                         g
           m                         h
           n                         i

6vwl-pdb-bundle2.pdb:
           j                         j
           k                         k
           l                         l
           m                         m
           n                         n
           o                         o
           p                         p
           q                         q
           r                         r
           s                         s
           t                         t
           1                         1
           4                         4
