Usage History of 'tref'

The following chart shows how frequently 'tref' appeared in printed materials over time. For example, the word 'tref' occurred 6 times in books in 1631 and 2,348 times in 2008. From 1631 to 2008, the word 'tref' was used a total of 31,048 times in books scanned by Google. See Reference: Google Ngram project.

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