Usage History of 'clusters'

The following chart shows how frequently 'clusters' appeared in printed materials over time. For example, the word 'clusters' occurred 2 times in books in 1568 and 413,585 times in 2008. From 1568 to 2008, the word 'clusters' was used a total of 9,405,258 times in books scanned by Google. See Reference: Google Ngram project.

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