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  • Operator + in front of a word signifies that the record must contain the word.
  • Operator - in front of a word signifies that the record must not contain the word.
  • If there is no operator in front of a word, the word is optional, and records containing the word are considered more relevant.
  • Operators < > determine the relevance of a word for the whole record. Operator < decreases, and operator > increases the relevance of the word for the whole record.
  • Brackets ( ) group words into phrases.
  • A tilde ~ in front of a word signifies negative relevance of a word for a record. It can be used with words that are often repeated, in order to eliminate them from the search.
  • An asterisk * is a postfix operator (it is put behind, and not in front of a word). It allows the search for all forms of a word beginning with the given morpheme.
  • "A phrase in double quotation marks" searches for records that contain the phrase as it is written.