Google Books Ngram Viewer

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

1800 - 1819 1820 - 1912 1913 - 1931 1932 - 1987 1988 - 2000 repro English
1800 - 1963 1964 - 1967 1968 1969 - 1979 1980 - 2000 reprex English

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