    New chain ID            Original chain ID

4v4a-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        AI
           J                        AJ
           K                        AK
           L                        AL
           M                        AM
           N                        AN
           O                        AO
           P                        AP
           Q                        AQ
           R                        AR
           S                        AS
           T                        AT

4v4a-pdb-bundle2.pdb:
           A                        B0
           B                        B9
           C                        BA
           D                        BB
           E                        BC
           F                        BD
           G                        BE
           H                        BF
           I                        BG
           J                        BH
           K                        BI
           L                        BJ
           M                        BK
           N                        BL
           O                        BM
           P                        BN
           Q                        BO
           R                        BP
           S                        BQ
           T                        BR
           U                        BS
           V                        BT
           W                        BU
           X                        BV
           Y                        BW
           Z                        BX
           a                        BY
           b                        BZ
           c                        B1
           d                        B2
           e                        B3
           f                        B4
           g                        B5
