Statistically Improbable Phrases

Statistically Improbable Phrases Amazon has this cool feature. "...are the most distinctive phrases in the text of books in the Search Inside! program. To identify SIPs, our computers scan the text of all books in Search Inside. If they find a phrase that occurs a large number of times in a particular book relative to all Search Inside books, that phrase is a SIP in that book." Click on on these SIPs and a new page is shown where one can then search the A9 search engine for the SIP.