Usage History of 'prolog'

The following chart shows how frequently 'prolog' appeared in printed materials over time. For example, the word 'prolog' occurred 2 times in books in 1507 and 13,255 times in 2008. From 1507 to 2008, the word 'prolog' was used a total of 775,867 times in books scanned by Google. See Reference: Google Ngram project.

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