    New chain ID            Original chain ID

6hxx-pdb-bundle1.pdb:
           A                        AA
           B                        Aa
           C                        AB
           D                        Ab
           E                        AC
           F                        Ac
           G                        AD
           H                        Ad
           I                        AE
           J                        Ae
           K                        AF
           L                        Af
           M                        AG
           N                        Ag
           O                        AH
           P                        Ah
           Q                        AI
           R                        Ai
           S                        AJ
           T                        Aj
           U                        AK
           V                        Ak
           W                        AL
           X                        Al
           Y                        AM
           Z                        Am
           a                        AN
           b                        An
           c                        AO
           d                        Ao
           e                        AP
           f                        Ap
           g                        AQ
           h                        Aq
           i                        AR
           j                        Ar
           k                        AS
           l                        As
           m                        AT
           n                        At
           o                        AU
           p                        Au
           q                        AV
           r                        Av
           s                        AW
           t                        Aw
           u                        AX
           v                        Ax
           w                        AY
           x                        Ay
           y                        AZ
           z                        Az
           0                        BA
           1                        Ba
           2                        BB
           3                        Bb
           4                        BC
           5                        Bc
           6                        BD
           7                        Bd
           8                        BE
           9                        Be

6hxx-pdb-bundle2.pdb:
           A                        BF
           B                        Bf
           C                        BG
           D                        Bg
           E                        BH
           F                        Bh
           G                        BI
           H                        Bi
