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• Performing a fuzzy search may retrieve terms with similar spellings: (( freie state of lippe ) OR ( freien state of lippe ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( freie state of lippe ) OR ( freien state of lippe ))".
• Adding a wildcard symbol may retrieve word variants: (( freie state of lippe ) OR ( freien state of lippe ))*.