    New chain ID            Original chain ID

8bmt-pdb-bundle1.pdb:
           A                         I
           B                         W
           C                         A
           D                         B
           E                         C
           F                         D
           G                         E
           H                         F
           I                         G
           J                         H
           K                         J
           L                         K
           M                         L
           N                         M
           O                         N
           P                         O
           Q                         P
           R                         Q
           S                         R
           T                         S
           U                         T
           V                         V
           W                         X
           X                         Y
           Y                         Z
           Z                        AA
           a                        BA
           b                        CA
