    New chain ID            Original chain ID

6v3a-pdb-bundle1.pdb:
           A                         0
           B                         1
           C                         2
           D                         3
           E                       AN1
           F                         B
           G                         C
           H                         D
           I                         E
           J                         F
           K                         G
           L                         H
           M                         I
           N                         J
           O                         K
           P                         L
           Q                         M
           R                         N
           S                         O
           T                         P
           U                         Q
           V                         R
           W                         S
           X                         T
           Y                         U
           Z                         V
           a                         W
           b                         X
           c                         Y
           d                         Z

6v3a-pdb-bundle2.pdb:
           A                       sN1
           B                         b
           C                         c
           D                         d
           E                         e
           F                         f
           G                         g
           H                         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
