Google Books Ngram Viewer

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

1900 - 1908 1909 - 1915 1916 - 1921 1922 - 1982 1983 - 2000 learn a trade English
1900 - 1913 1914 - 1972 1973 - 1981 1982 - 1991 1992 - 2000 go to school English

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