    New chain ID            Original chain ID

4v4s-pdb-bundle1.pdb:
           A                        AA
           B                        AV
           C                        AW
           D                        AX
           E                        AB
           F                        AC
           G                        AD
           H                        AE
           I                        AF
           J                        AG
           K                        AH
           L                        AI
           M                        AJ
           N                        AK
           O                        AL
           P                        AM
           Q                        AN
           R                        AO
           S                        AP
           T                        AQ
           U                        AR
           V                        AS
           W                        AT
           X                        AU
           Y                        AY
           Z                        BB

4v4s-pdb-bundle2.pdb:
           A                        BA
           B                        BD
           C                        BE
           D                        BF
           E                        BG
           F                        BH
           G                        BI
           H                        BN
           I                        BO
           J                        BP
           K                        BQ
           L                        BS
           M                        BT
           N                        BW
           O                        BX
           P                        BY
           Q                        BZ
           R                        BR
           S                        BU
           T                        BV
           U                        B2
           V                        B3
           W                        B0
           X                        B4
           Y                        B5
           Z                        B6
           a                        B7
           b                        B8
           c                        B9
           d                        BK
