    New chain ID            Original chain ID

7unf-pdb-bundle1.pdb:
           a                         a
           U                         U
           L                         L
           M                         M
           N                         N
           O                         O
           P                         P
           Q                         Q
           D                         D
           b                         b
           c                         c
           d                         d
           e                         e
           f                         f
           g                         g
           F                         F
           C                         C
           H                         H
           k                         k
           m                         m
           n                         n
           s                         s
           r                         r
           8                         8
           9                         9
           1                         1
           2                         2
           3                         3
           4                         4
           5                         5
           6                         6
           7                         7
           0                         0
           t                         t
           w                         w
