Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
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1800 - 1869 1870 - 1978 1979 - 1985 1986 - 1992 1993 - 2000 democrazia Italian
1800 - 1875 1876 - 1968 1969 - 1979 1980 - 1989 1990 - 2000 responsabilità Italian

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