Google Books Ngram Viewer

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

1500 - 1670 1671 - 1788 1789 - 1811 1812 - 1923 1924 - 2008 conceal English

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