Google Books Ngram Viewer

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

1800 - 1982 1983 - 1991 1992 - 1993 1994 - 2003 2004 - 2008 artificial intelligence English
1800 - 1983 1984 - 1992 1993 - 1994 1995 - 2003 2004 - 2008 natural language processing English
1800 - 1988 1989 - 2002 2003 - 2004 2005 - 2006 2007 - 2008 machine learning English

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