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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.
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.