    New chain ID            Original chain ID

11fg-pdb-bundle1.pdb:
           A                        Ar
           B                         Z
           C                         A
           D                         B
           E                        Cj
           F                         C
           G                         D
           H                         E
           I                         F
           J                        As
           K                         a
           L                         G
           M                         H
           N                        Ck
           O                         I
           P                         J
           Q                         K
           R                         L
           S                        At
           T                         b
           U                         M
           V                         N
           W                        Cl
           X                         O
           Y                         P
           Z                         Q
           a                         R
           b                        Au
           c                         c
           d                         S
           e                         T
           f                        Cm
           g                         U
           h                         V
           i                         W
           j                         X
           k                        Av
           l                         d
           m                         Y
           n                         e
           o                        Cn
           p                         f
           q                         g
           r                         h
           s                         i
