    New chain ID            Original chain ID

9ska-pdb-bundle1.pdb:
           A                         5
           B                         6
           C                         7
           D                         8
           E                         9
           F                         A
           G                        AA
           H                        AB
           I                        AC
           J                        AD
           K                        AE
           L                         B
           M                         C
           N                         D
           O                         E
           P                         F
           Q                         G
           R                         H
           S                         I
           T                         J
           U                         K
           V                         L
           W                         M
           X                         N
           Y                         O
           Z                         P
           a                         Q
           b                         R
           c                         S
           d                         T
           e                         U
           f                         V
           g                         Z
