    New chain ID            Original chain ID

4v6b-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                        BA
           x                        Ba
           y                        BB
           z                        Bb
           0                        BC
           1                        Bc
           2                        BD
           3                        Bd
           4                        BE
           5                        Be
           6                        BF
           7                        Bf
           8                        BG
           9                        Bg

4v6b-pdb-bundle2.pdb:
           A                        BH
           B                        Bh
           C                        BI
           D                        Bi
           E                        BJ
           F                        Bj
           G                        BK
           H                        Bk
           I                        BL
           J                        Bl
           K                        BM
           L                        Bm
           M                        BN
           N                        Bn
           O                        BO
           P                        Bo
           Q                        BP
           R                        Bp
           S                        BQ
           T                        Bq
           U                        BR
           V                        Br
           W                        BS
           X                        Bs
           Y                        BT
           Z                        Bt
           a                        BU
           b                        Bu
           c                        BV
           d                        Bv
           e                        BW
           f                        Bw
           g                        BX
           h                        Bx
           i                        CA
           j                        Ca
           k                        CB
           l                        Cb
           m                        CC
           n                        Cc
           o                        CD
           p                        Cd
           q                        CE
           r                        Ce
           s                        CF
           t                        Cf
           u                        CG
           v                        Cg
           w                        CH
           x                        Ch
           y                        CI
           z                        Ci
           0                        CJ
           1                        Cj
           2                        CK
           3                        Ck
           4                        CL
           5                        Cl
           6                        CM
           7                        Cm
           8                        CN
           9                        Cn

4v6b-pdb-bundle3.pdb:
           A                        CO
           B                        Co
           C                        CP
           D                        Cp
           E                        CQ
           F                        Cq
           G                        CR
           H                        Cr
           I                        CS
           J                        Cs
           K                        CT
           L                        Ct
           M                        CU
           N                        Cu
           O                        CV
           P                        Cv
           Q                        CW
           R                        Cw
           S                        CX
           T                        Cx
