Usage History of 'tetras'

The following chart shows how frequently 'tetras' appeared in printed materials over time. For example, the word 'tetras' occurred 2 times in books in 1712 and 452 times in 2008. From 1712 to 2008, the word 'tetras' was used a total of 19,753 times in books scanned by Google. See Reference: Google Ngram project.

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