    New chain ID            Original chain ID

6wat-pdb-bundle1.pdb:
           A                        AA
           B                        AC
           C                        BA
           D                        BC
           E                        CA
           F                        CC
           G                        DA
           H                        DC
           I                        EA
           J                        EC
           K                        FA
           L                        FC
           M                        GA
           N                        GC
           O                        HA
           P                        HC
           Q                        IA
           R                        IC
           S                        JA
           T                        JC
           U                        KA
           V                        KC
           W                        LA
           X                        LC
           Y                        MA
           Z                        MC
           a                        NA
           b                        NC
           c                        OA
           d                        OC
           e                         A
           f                         B
           g                         C
           h                         D
           i                         E
           j                         F
           k                         G
           l                         H
           m                         I
           n                         J
           o                         K
           p                         L
           q                         M
           r                         N
           s                         O
           t                         P
           u                         Q
           v                         R
           w                         S
           x                         T
           y                         V
           z                         Y
           0                         Z
           1                         a
           2                         b
           3                         c
           4                         d
           5                         e
           6                         f
           7                         g
