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Search: ?word* : searches anything that begins with 'word'
"word" : searches 'word' literally, as it was typed
+word : 'word' must be present
-word : 'word' must not be present
>word : increases the relevance of 'word'
<word : decreases the relevance of 'word'
( ) : groups words
~word : 'word' gets a negative relevance