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The Boolean products of sets defined by topics should provide information about the relationship betweenthose topics. With a large outline, this information can be quite unexpected, yielding new insights about the relation. That is, you do a Boolean "and" search on the topics whose inter-relation you want to query, to find the common infoitems.
Boolean sums are time-saving although less dramatically useful. Instead of surveying the topics to look for an item you know falls in one, you could get a single list by an 'or' search on the topics.
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