    New chain ID            Original chain ID

6v8w-pdb-bundle1.pdb:
           A                         A
           B                        AA
           C                         B
           D                        BB
           E                         C
           F                        CC
           G                         D
           H                        DD
           I                         E
           J                        EE
           K                         F
           L                        FF
           M                         G
           N                        GG
           O                         H
           P                        HH
           Q                         I
           R                        II
           S                         J
           T                        JJ
           U                         K
           V                        KK
           W                         L
           X                        LL
           Y                         M
           Z                        MM
           a                         N
           b                        NN
           c                         O
           d                        OO
           e                         P
           f                        PP
           g                         Q
           h                        QQ
           i                         R
           j                        RR
           k                         S
           l                        SS
           m                         T
           n                        TT
           o                         U
           p                        UU
           q                         V
           r                        VV
           s                         W
           t                        WW
           u                         X
           v                        XX
           w                         Y
           x                        YY
           y                         Z
           z                        ZZ
