    New chain ID            Original chain ID

9iwr_1-pdb-bundle1.pdb:
           A                         1
           B                         2
           C                         3
           D                         4
           E                         5
           F                         6
           G                         7
           H                         A
           I                         B
           J                         C
           K                         D
           L                         E
           M                         F
           N                         G
           O                         H
           P                         I
           Q                         J
           R                         K
           S                         L
           T                         M
           U                         N
9iwr_1-pdb-bundle2.pdb:
           A                         N
           B                         O
           C                         P
           D                         Q
           E                         R
           F                         S
           G                         T
           H                         U
           I                         V
           J                         W
           K                         X
           L                         Y
           M                         Z
           N                         a
           O                         b
           P                         c
           Q                         d
           R                         e
           S                         f
           T                         g
           U                         h
           V                         i
9iwr_1-pdb-bundle3.pdb:
           A                         i
           B                         j
           C                         k
           D                         l
           E                         m
           F                         n
