50. The method of claim 49 further comprising adding the sequence of words as a significant phrase to a significant phrase data structure if: the number of words in the sequence that have the score greater than the threshold score equals or exceeds a predetermined number and the number of words in the sequence satisfies a verbosity setting.
51. The method of claim 50 further comprising: retrieving a sentence from the document if the sentence contains a significant phrase stored in the significant phrases data structure; and operating the processing unit to search the abstract of the document to determine whether the sentence is included in the abstract.