What river flows through both Austria and Romania?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q5', 'id': 0, 'label': 'human'}, {'type': 'INTERNAL', 'name_': 'Q6760', 'id': 1, 'label': 'UTC+03:00'}, {'type': 'INTERNAL', 'name_': 'Q212', 'id': 2, 'label': 'Ukraine'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q40', 'id': 3, 'label': 'Austria'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q218', 'id': 4, 'label': 'Romania'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q187925', 'id': 5, 'label': 'Caraș-Severin County'}, {'type': 'INTERNAL', 'name_': 'Q97280965', 'id': 6, 'label': 'Traian Bădescu'}], 'links': [{'name_': 'P1963', 'source': 0, 'target': 3, 'label': 'properties for this type'}, {'name_': 'P421', 'source': 2, 'target': 1, 'label': 'located in time zone'}, {'name_': 'P17', 'source': 2, 'target': 2, 'label': 'country'}, {'name_': 'P530', 'source': 2, 'target': 3, 'label': 'diplomatic relation'}, {'name_': 'P530', 'source': 2, 'target': 4, 'label': 'diplomatic relation'}, {'name_': 'P421', 'source': 5, 'target': 1, 'label': 'located in time zone'}, {'name_': 'P17', 'source': 5, 'target': 4, 'label': 'country'}, {'name_': 'P31', 'source': 6, 'target': 0, 'label': 'instance of'}, {'name_': 'P19', 'source': 6, 'target': 5, 'label': 'place of birth'}]}