    New chain ID            Original chain ID

10pl-pdb-bundle1.pdb:
           A                        Ba
           B                        Bd
           C                        Bc
           D                        Bb
           E                        Bk
           F                        Bj
           G                        Bi
           H                        Bh
           I                        Bg
           J                        Bf
           K                        Be
           L                         F
           M                         A
           N                         B
           O                         C
           P                         D
           Q                         E
           R                        Ab
           S                        Ag
           T                        Ah
           U                        Af
           V                        Ae
           W                        Ad
           X                        Ac
           Y                        Aa
