    New chain ID            Original chain ID

7k6v-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        BA
           E                        BB
           F                        BC
           G                        CA
           H                        CB
           I                        CC
           J                        DA
           K                        DB
           L                        DC
           M                        EA
           N                        EB
           O                        EC
           P                        FA
           Q                        FB
           R                        FC
           S                        GA
           T                        GB
           U                        GC
           V                        HA
           W                        HB
           X                        HC
           Y                        IA

7k6v-pdb-bundle2.pdb:
           A                        IB
           B                        IC
           C                        JA
           D                        JB
           E                        JC
           F                        KA
           G                        KB
           H                        KC
           I                        LA
           J                        LB
           K                        LC
           L                        MA
           M                        MB
           N                        MC
           O                        NA
           P                        NB
           Q                        NC
           R                        OA
           S                        OB
           T                        OC
