Google Books Ngram Viewer

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

1941 - 1954 1955 - 1994 1995 - 1998 1999 - 2002 2003 - 2008 canonical English
1941 - 1947 1948 - 1989 1990 - 1996 1997 - 2003 2004 - 2008 natural English
1941 - 1947 1948 - 1961 1962 - 1967 1968 - 2001 2002 - 2008 universal English

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