Google Books Ngram Viewer

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

1700 - 1746 1747 - 1920 1921 - 1939 1940 - 1986 1987 - 2008 extase French

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