    New chain ID            Original chain ID

5gpn-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                         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                         t
           s                         u
           t                         v
           u                         w
           v                         x
           w                         0
           x                         1
           y                         2
           z                         3
           0                         4
           1                         5
           2                         6
           3                         7
           4                         8
           5                         9
           6                         s
           7                         y
           8                         z
           9                        Aa

5gpn-pdb-bundle2.pdb:
           A                        Ab
           B                        Ac
           C                        Ad
           D                        Ae
           E                        Af
           F                        Ag
           G                        Ah
           H                        Ai
           I                        Aj
           J                        Ak
           K                        Al
           L                        Am
           M                        An
           N                        Ao
           O                        Ap
           P                        Aq
           Q                        Ar
           R                        As
           S                        At
           T                        Au
           U                        Av
           V                        Aw
