Google Books Ngram Viewer

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

1800 - 1827 1828 - 1890 1891 - 1906 1907 - 1994 1995 - 2010 smile English
1800 - 1827 1828 - 1908 1909 - 1924 1925 - 1982 1983 - 2010 teeth English
1800 - 1827 1828 - 1896 1897 - 1911 1912 - 1984 1985 - 2010 lips English
1800 - 1825 1826 - 1899 1900 - 1914 1915 - 1986 1987 - 2010 cheeks English

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