    New chain ID            Original chain ID

8ib4-pdb-bundle1.pdb:
           A                         A
           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
           X                         X
           Y                         Y
           Z                         Z
           a                         a
           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                        AA
           u                        AB
           v                        AC
           w                        AD
           x                        AE
           y                        AF
           z                        AG
           0                        AH
           1                        AI
           2                        AJ
           3                        AK
           4                        Aa
           5                        Ab
           6                        Ac
           7                        Ad
           8                        Ae
           9                        Af

8ib4-pdb-bundle2.pdb:
           A                        Ag
           B                        Ah
           C                        Aj
           D                        Ak
