Google Books Ngram Viewer

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

1800 - 1910 1911 - 1992 1993 - 1997 1998 - 2002 2003 - 2008 systemic English
1800 - 1849 1850 - 1971 1972 - 1982 1983 - 1994 1995 - 2008 systematic English

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