Question: Which state of Tendaho dam is the headquarters of Ethiopian People's revolutionary democratic Front located ?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Ethiopian_People's_Revolutionary_Democratic_Front> prop:headquarters ?uri. <http://dbpedia.org/resource/Tendaho_Dam> prop:country ?uri}