Usage History of 'sora'

The following chart shows how frequently 'sora' appeared in printed materials over time. For example, the word 'sora' occurred 4 times in books in 1590 and 4,854 times in 2008. From 1590 to 2008, the word 'sora' was used a total of 133,674 times in books scanned by Google. See Reference: Google Ngram project.

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