Google's Really Advanced Search

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You've know doubt heard of Advanced Search. How about Really Advanced Search?

I spotted this at the bottom of a Google Search Results page today and had to take a look.

Among the search features, including the usual ones, are:

• words almost, but not quite entirely unlike:
• rhyming slang for:
• this exact word or phrase, whose sum of unicode code points is a mersenne prime:
• subtext or innuendo for:

and this:

• the words , but not , unless they contain either the intersection of phrases , , and or a gerund in which case the disjunction of and will also be taken into account (on Tuesdays). 

At the bottom of the page are also several links:

You can also... Tickle a unicorn Download our ranking code so you can run Google at home Search by odor Some of the features of really advanced search might make a good coding project. They might also be a challenge to explain. But they really make a better April Fools Joke.