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mads.xsd"><authority><topic authority="http://general-terms.thesaurus.ekt.gr/vocab">landforms</topic></authority><related type="narrower"><topic>beaches</topic></related><related type="narrower"><topic>caves</topic></related><related type="narrower"><topic>coasts</topic></related><related type="narrower"><topic>continents</topic></related><related type="narrower"><topic>deserts</topic></related><related type="narrower"><topic>glaciers</topic></related><related type="narrower"><topic>gorges</topic></related><related type="narrower"><topic>icebergs</topic></related><related type="narrower"><topic>islands</topic></related><related type="narrower"><topic>lakes</topic></related><related type="narrower"><topic>mountains</topic></related><related type="narrower"><topic>rivers</topic></related><related type="narrower"><topic>volcanoes</topic></related><related type="narrower"><topic>waterfalls</topic></related></mads>