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• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"interaction algorithm.\") OR (\"integrative algorithm.\"))) OR (\"matematicas algorithm.\"))~".
• Removing quotes may allow a broader search: (((( interaction algorithm. ) OR ( integrative algorithm. ))) OR ( matematicas algorithm. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("interaction algorithm.") OR ("integrative algorithm."))) OR ("matematicas algorithm."))*.