 | Only words with 2 or more characters are accepted; Max 200 chars total;
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| Space is used to split words;
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| The default operator between two words separated by a space is AND.
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| "..." can be used to search for a whole string (not indexed search then);
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| AND, OR and NOT are prefix words, overruling the default operator;
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| + / | / - equals AND, OR and NOT as operators;
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| All search words are converted to lowercase. |