    New chain ID            Original chain ID

9sum-pdb-bundle1.pdb:
           1                         1
           2                         2
           A                         A
           B                         B
           C                         C

9sum-pdb-bundle2.pdb:
           A                        CA
           B                         D
           C                         E
           D                         F
           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                         U
           T                         V
           U                         W
           V                         X
           W                         Y
           X                         Z
           Y                        ZA
           Z                        ZB
           a                        ZC
           b                        ZD
           c                        ZE
           d                        ZF
           e                        ZG
           f                        ZH
           g                        ZI
           h                        ZJ
           i                        ZK
           j                        ZL
           k                        ZM
           l                        ZO
           m                        ZP
           n                        ZQ
           o                        ZR
           p                        ZS
           q                        ZT
           r                        ZU
           s                        ZV
           t                        ZW
           u                        ZY
           v                         a
           w                         b

9sum-pdb-bundle3.pdb:
           c                         c
           d                         d
           e                         e
           f                         f
           g                         g
           h                         h
           i                         i
           j                         j
           k                         k
           l                         l
           m                         m
           n                         n
           o                         o
           p                         p
           q                         q
           r                         r
           s                         s
           t                         t
           u                         u
           v                         v
           w                         w
           x                         x
           y                         y
           z                         z
