    New chain ID            Original chain ID

7uio-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                        Ao
           D                        Ab
           E                        Ac
           F                        An
           G                        Ae
           H                        Ap
           I                        GA
           J                        GB
           K                        At
           L                        Ag
           M                        Ah
           N                        Ai
           O                        Aj
           P                        Ak
           Q                        Aq
           R                        Ar
           S                        As
           T                        Au
           U                        Av
           V                        Aw
           W                        Az
           X                        AA
           Y                        AB
           Z                        AC
           a                        AD
           b                        AE
           c                        AF
           d                        AG
           e                        AH
           f                        AI
           g                        AJ
           h                        AK
           i                        AL
           j                        AM
           k                        AP
           l                        AQ
           m                        AS
           n                        Aa
           o                        Ad
           p                        Af
           q                        Bo
           r                        Bb
           s                        Bc
           t                        Bn
           u                        Be

7uio-pdb-bundle2.pdb:
           A                        Bp
           B                        Bt
           C                        Bg
           D                        Bh
           E                        Bi
           F                        Bj
           G                        Bk
           H                        Bq
           I                        Br
           J                        Bs
           K                        Bu
           L                        Bv
           M                        Bw
           N                        Bz
           O                        BA
           P                        BB
           Q                        BC
           R                        BD
           S                        BE
           T                        BF
           U                        BG
           V                        BH
           W                        BI
           X                        BJ
           Y                        BK
           Z                        BL
           a                        BM
           b                        BP
           c                        BQ
           d                        BS
           e                        Ba
           f                        Bd
           g                        Bf
