    New chain ID            Original chain ID

7o9k-pdb-bundle1.pdb:
           A                         0
           B                         a
           C                         1
           D                         2
           E                         3
           F                         4
           G                         5
           H                         6
           I                         7
           J                         8
           K                         9
           L                         A
           M                        A1
           N                         B
           O                        A2
           P                         C
           Q                         D
           R                         E
           S                         F
           T                        FF
           U                         G
           V                         H
           W                         I
           X                         J
           Y                         K
           Z                         L
           a                         M
           b                         N
           c                         O
           d                         P
           e                         Q
           f                         R
           g                         S
           h                         T
           i                         U
           j                         V
           k                         W
           l                         X
           m                         Y
           n                         Z
           o                         b
           p                         c
           q                         d
           r                         e
           s                         f
           t                         g
           u                         h
           v                         i
           w                         j
           x                         k
           y                         l
           z                         m

7o9k-pdb-bundle2.pdb:
           A                         n
           B                         o
           C                         p
           D                         q
           E                         r
           F                         s
           G                         t
           H                        t1
           I                        t2
           J                        t3
           K                        t4
           L                        t5
           M                        t6
           N                         u
           O                         v
           P                         w
           Q                       UNK
