    New chain ID            Original chain ID

22mm_1-pdb-bundle1.pdb:
           A                         U
           B                         V
           C                         W
           D                         X
           E                         Y
           F                         Z
           G                         a
           H                         c
           I                         d
           J                         e
           K                         A
           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                         g
           f                         h
           g                         i
           h                         j
           i                         k
           j                         l
           k                         m
           l                         n
           m                         o
           n                         p
           o                         q
           p                         r
           q                         s
           r                         t
           s                         f
           t                         u
22mm_1-pdb-bundle2.pdb:
           A                         u
