Google Books Ngram Viewer

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

1900 - 1964 1965 - 1984 1985 - 1987 1988 - 1998 1999 - 2000 audiolingual method English

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