    New chain ID            Original chain ID

7rk8-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
           I                         I
           J                         J
           K                         K
           L                         L
           M                         M
           N                         N
           O                         O
           P                         P
           Q                         Q
           R                         R
           S                         S
           T                         T
           V                         V
           W                         W
           X                         X
           Y                         Y

7rk8-pdb-bundle2.pdb:
           A                         Z
           B                        AA
           C                        BA
           D                        CA
           E                        DA
           F                        EA
           G                        FA
           H                        GA
           I                        HA
           J                        IA
           K                        JA
           L                        KA
           M                        LA
           N                        MA
           O                        NA
           P                        OA
           Q                        PA
           R                        QA
           S                        RA
           T                        SA
           U                        TA
           V                        UA
           W                        VA
           X                        WA

7rk8-pdb-bundle3.pdb:
           A                        XA
           B                        YA
           C                        ZA
           D                        AB
           E                        BB
           F                        CB
           G                        DB
           H                        EB
           I                        FB
           J                        GB
           K                        HB
           L                        IB
