Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1920 - 1933 1934 - 1975 1976 - 1981 1982 - 2002 2003 - 2008 sex English
1920 - 1927 1928 - 1934 1935 - 1958 1959 - 1997 1998 - 2008 virtue English

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