    New chain ID            Original chain ID

4v4v-pdb-bundle1.pdb:
           A                        AA
           B                        AU
           C                        AV
           D                        AW
           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

4v4v-pdb-bundle2.pdb:
           A                        B0
           B                        B9
           C                        B2
           D                        B3
           E                        B5
           F                        BA
           G                        BB
           H                        BC
           I                        BD
           J                        BE
           K                        BF
           L                        BG
           M                        BH
           N                        BI
           O                        BJ
           P                        BK
           Q                        BL
           R                        BM
           S                        BN
           T                        BO
           U                        BQ
           V                        BR
           W                        BS
           X                        BT
           Y                        BU
           Z                        BW
           a                        BX
           b                        BZ
           c                        B1
