Google Books Ngram Viewer

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

1800 - 1909 1910 - 1930 1931 - 1935 1936 - 1981 1982 - 2008 high schools English

Run your own experiment! Raw data is available for download here.
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