    New chain ID            Original chain ID

4ujc-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        A2
           E                        A3
           F                        A4
           G                        BA

4ujc-pdb-bundle2.pdb:
           A                        BB
           B                        BC
           C                        BD
           D                        BE
           E                        BF
           F                        BG
           G                        BH
           H                        BI
           I                        BJ
           J                        BL
           K                        BM
           L                        BN
           M                        BO
           N                        BP
           O                        BQ
           P                        BR
           Q                        BS
           R                        BT
           S                        BU
           T                        BV
           U                        BW
           V                        BX
           W                        BY
           X                        BZ
           Y                        Ba
           Z                        Bb
           a                        Bc
           b                        Bd
           c                        Be
           d                        Bf
           e                        Bg
           f                        Bh
           g                        Bi
           h                        Bj
           i                        Bk
           j                        Bl
           k                        Bm
           l                        Bn
           m                        Bo
           n                        Bp
           o                        Bt
           p                        Bu
           q                        C1
           r                        CA
           s                        CB
           t                        CC
           u                        CD
           v                        CE
           w                        CF

4ujc-pdb-bundle3.pdb:
           A                        CG
           B                        CH
           C                        CI
           D                        CJ
           E                        CK
           F                        CL
           G                        CM
           H                        CN
           I                        CO
           J                        CP
           K                        CQ
           L                        CR
           M                        CS
           N                        CT
           O                        CU
           P                        CV
           Q                        CW
           R                        CX
           S                        CY
           T                        CZ
           U                        Ca
           V                        Cb
           W                        Cc
           X                        Cd
           Y                        Ce
           Z                        Cf
           a                        Cg
