    New chain ID            Original chain ID

7pqd-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AG
           H                        AH
           I                        AI
           J                        AJ
           K                        AK
           L                        AL
           M                        AM
           N                        AN
           O                        BA
           P                        BB
           Q                        BC
           R                        BD
           S                        BE
           T                        BF
           U                        BG
           V                        BH
           W                        BI
           X                        BJ
           Y                        BK
           Z                        BL
           a                        BM
           b                        BN
           c                         H
           d                         L
           e                         M
           f                        UA
           g                        UB
           h                        UU
           i                         X
           j                        aa
           k                        ab
           l                        ac
           m                        ad
           n                        ae
           o                        af
           p                        ag
           q                        ah
           r                        ai
           s                        aj
           t                        ak
           u                        al
           v                        am
           w                        an
           x                        ba
           y                        bb
           z                        bc
           0                        bd
           1                        be
           2                        bf
           3                        bg
           4                        bh
           5                        bi
           6                        bj
           7                        bk
           8                        bl
           9                        bm

7pqd-pdb-bundle2.pdb:
           A                        bn
           B                         h
           C                         l
           D                         m
           E                        ua
           F                        ub
           G                        uu
           H                         x
