Google Books Ngram Viewer

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

1720 - 1825 1826 - 1975 1976 - 1987 1988 - 1999 2000 - 2008 haha English
1720 - 1756 1757 - 1767 1768 - 1776 1777 - 1981 1982 - 2008 hehe English
1720 - 1807 1808 - 1926 1927 - 1939 1940 - 1999 2000 - 2008 hoho English

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