| 摘要 |
A method of searching a database utilizing a dispensability indicator includes entering a logical expression into a search engine, indicating the dispensability of a portion of the logical expression to define a primary search strategy and a secondary search strategy, and returning search results that include records satisfying the primary search strategy. The dispensability of each portion of the logical expression is indicated by embracing at least a portion of the logical expression with the dispensability indicator. A search result with records that satisfy the requirements of the secondary search strategy is automatically returned in response to a failure to return records satisfying the requirements of the primary search strategy.
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