    New chain ID            Original chain ID

8qbx-pdb-bundle1.pdb:
           A                         F
           B                         C
           C                         A
           D                         B
           E                         D
           F                         E
           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
           U                         V
           V                         W
           W                         X
           X                         Y
           Y                         Z
           Z                        AA
           a                        BA
           b                        CA
           c                        DA
           d                        EA
           e                        FA
           f                        GA

8qbx-pdb-bundle2.pdb:
           A                        HA
           B                        IA
           C                        JA
           D                        KA
           E                        LA
           F                        MA
           G                        NA
           H                        OA
           I                        PA
           J                        QA
           K                        RA
           L                        SA
           M                        TA
           N                        UA
           O                        VA
           P                        WA
           Q                        XA
           R                        YA
           S                        ZA
           T                        AB
           U                        BB
           V                        CB
           W                        DB
           X                        EB
           Y                        FB
           Z                        GB
           a                        HB
           b                        IB
