Google Books Ngram Viewer

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

1980 1981 - 1983 1984 1985 - 1998 1999 - 2000 idiot doctor English
1980 1981 1982 1983 - 1994 1995 - 1996 idiotic doctor English

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