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In this segment Im going to introduce phrase queries, which in practice have been the most important kind of extended Boolean query and then examine how you need to extend our inverted index data structure to be able to handle phrase queries. So very often wed like to query not only for individual words, but also for multi-word units. Many useful things that we want to query on are multi-word units. So information retrieval is a multi-word unit, or many many other things like organization names: Stanford University. So, what we want to do is have a mechanism where we can say, letamp;#39;s match this pair of words as a unit. And the syntax thatamp;#39;s standardly used in modern web search engines is to put it in inverted quotes like that. And so if we have that kind of phrase as a query, then what weamp;#39;re going to say is a document that says amp;quot;I went to university at Stanfordamp;quot; doesnamp;#39;t match that phrase query. So this notion of putting things in invert
