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Precedence of Search Operators
Boolean and Proximity operators have this precedence:
Highest:      NOT
              NEAR; DNEAR; XNEAR; YNEAR
              AND; BEFORE; AFTER; WHEN; SENTENCE; PARAGRAPH
Lowest:       OR; WNEAR; EOR
Operators that have the same level of precedence have neither left or right associativity. You can use brackets to bind terms together as appropriate. Proximity operators must have terms on either side and cannot be adjacent to brackets.