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* Overview of searches
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> 3.   2366   search ([ALL] all words) peer-reviewed
> 2.   138540   search ([ALL] all words) engineering
> 1.   2339980   search ([ALL] all words) online
  

You can combine sets by including set numbers in the command line of your search request, for example: 's1 and s2' or 's1 or s3', or by selecting the sets and clicking on one of the Combine buttons.