    New chain ID            Original chain ID

7zrs-pdb-bundle1.pdb:
           2                         2
           3                         3
           4                         4

7zrs-pdb-bundle2.pdb:
           A                         5
           B                         6
           C                        AA
           D                        AB
           E                        AC
           F                        AD
           G                        AE
           H                        AF
           I                        AG
           J                        AH
           K                        AI
           L                        AJ
           M                        AK
           N                        AL
           O                        AM
           P                        AN
           Q                        AO
           R                        AP
           S                        AQ
           T                        AR
           U                        AS
           V                        AT
           W                        AU
           X                        AV
           Y                        AW

7zrs-pdb-bundle3.pdb:
           A                        AX
           B                        AY
           C                        AZ
           D                        Aa
           E                        Ab
           F                        Ac
           G                        Ad
           H                        Ae
           I                        Af
           J                        Ag
           K                        BA
           L                        BB
           M                        BC
           N                        BD
           O                        BE
           P                        BF
           Q                        BG
           R                        BH
           S                        BI
           T                        BJ
           U                        BK
           V                        BL
           W                        BM
           X                        BN
           Y                        BO
           Z                        BP
           a                        BQ
           b                        BR
           c                        BS
           d                        BT
           e                        BU
           f                        BV
           g                        BW
           h                        BX
           i                        BY
           j                        BZ
           k                        Ba
           l                        Bb
           m                        Bc
           n                        Bd
           o                        Be
           p                        Bf
           q                        Bg
           r                        Bh
           s                        Bi
           t                        Bj
           u                        Bk
           v                        Bl
           w                        Bm
           x                        Bn
           y                        Bo
           z                        CA
           0                        CB
           1                        CC
