    New chain ID            Original chain ID

5kps-pdb-bundle1.pdb:
           A                         A
           B                         B
           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
           a                         1
           b                         2
           c                         3
           d                         4
           e                         5
           f                         6
           g                         7
           h                         8
           i                         9
           j                        10
           k                        11
           l                        12
           m                        13
           n                        14
           o                        15
           p                        16
           q                        17
           r                        18
           s                        19
           t                        20
           u                        21
           v                        22
           w                        23
           x                        24
           y                        25
           z                        26
           0                        27

5kps-pdb-bundle2.pdb:
           A                        28
           B                        29
           C                        30
           D                        31
           E                        32
