Usage History of 'subrule'

The following chart shows how frequently 'subrule' appeared in printed materials over time. For example, the word 'subrule' occurred 2 times in books in 1849 and 826 times in 2008. From 1849 to 2008, the word 'subrule' was used a total of 28,997 times in books scanned by Google. See Reference: Google Ngram project.

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