Usage History of 'clues'

The following chart shows how frequently 'clues' appeared in printed materials over time. For example, the word 'clues' occurred 2 times in books in 1564 and 194,215 times in 2008. From 1564 to 2008, the word 'clues' was used a total of 4,801,268 times in books scanned by Google. See Reference: Google Ngram project.

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