Google Books Ngram Viewer

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

1800 - 1950 1951 - 1990 1991 - 1994 1995 - 1997 1998 - 2000 infeasible English
1800 - 1891 1892 - 1975 1976 - 1980 1981 - 1992 1993 - 2000 unfeasible English
1800 - 1913 1914 - 1976 1977 - 1983 1984 - 1990 1991 - 2000 not feasible English

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