    New chain ID            Original chain ID

9buh-pdb-bundle1.pdb:
           A                         A
           B                         t
           C                         F
           D                         K
           E                         U
           F                         Z
           G                         a
           H                         i
           I                         m
           J                         p
           K                         q
           L                        Aa
           M                        Ab
           N                        Ac
           O                        Ad
           P                        Ag
           Q                        Ah
           R                        Ai
           S                        Aj
           T                        Ak
           U                        Al
           V                        Am
           W                        An
           X                        Ao
           Y                        Ap
           Z                        Aq
           a                        Ar
           b                         0
           c                         1
           d                         2
           e                         3
           f                         4
           g                         5
           h                         6
           i                         7
           j                         8
           k                         9
           l                         B
           m                         C
           n                         D
           o                         E
           p                         G
           q                         H
           r                         I
           s                         J
           t                         L
           u                         M
           v                         N
           w                         O
           x                         P
           y                         Q
           z                         S
           0                         T
           1                         V
           2                         W
           3                         Y
           4                         b
           5                         c
           6                         d
           7                         e
           8                         f
           9                         g

9buh-pdb-bundle2.pdb:
           A                         h
           B                         j
           C                         k
           D                         l
           E                         n
           F                         o
           G                         r
           H                         s
           I                         u
           J                         v
           K                         w
           L                         x
           M                         y
           N                         z
           O                         X
           P                         R
           Q                        Ae
           R                        Af
