Google Books Ngram Viewer

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

1800 - 1851 1852 - 1924 1925 - 1934 1935 - 1990 1991 - 2000 heart rendering English

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