    New chain ID            Original chain ID

9xad-pdb-bundle1.pdb:
           A                         E
           B                         H
           C                         I
           D                         J
           E                         K
           F                         L
           G                         M
           H                         O
           I                         P
           J                         Q
           K                         R
           L                         S
           M                         T
           N                         V
           O                         W
           P                         Z
           Q                         a
           R                         b
           S                         c
           T                         e
           U                         f
           V                         h
           W                         i
           X                         A
           Y                         0
           Z                         1
           a                         2
           b                         3
           c                         4
           d                         5
           e                         7
           f                        SA
           g                        SC
           h                        SR
           i                        SV
