    New chain ID            Original chain ID

7uit-pdb-bundle1.pdb:
           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
           t                         u
           u                         v
           v                         w
           w                         x
           x                         y
           y                         z
           z                         0
           0                         1
           1                         2
           2                         3
           3                         4
           4                         5
           5                         6
           6                         7
           7                         8
           8                         9
           9                        AA

7uit-pdb-bundle2.pdb:
           A                        BA
           B                        CA
           C                        DA
           D                        EA
           E                        FA
           F                         A
           G                        JA
           H                        GA
           I                        HA
           J                        IA
