    New chain ID            Original chain ID

8bpx-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                         i
           i                         j
           j                         k
           k                         l
           l                         m
           m                         n
           n                         o
           o                         p
           p                         q
           q                         u
           r                         v
           s                         x
           t                         y
           u                         z
           v                        AA
           w                        AB
           x                        AC
           y                        AD
           z                        AE
           0                        AF
           1                        AG
           2                        AH
           3                        AI
           4                        AJ
           5                        BA
           6                        BB
           7                        BC
           8                        BD

8bpx-pdb-bundle2.pdb:
           A                        BE
           B                        BF
           C                        BG
           D                        BH
           E                        BI
           F                        BJ
