How many countries span the Sahara desert?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q5772665', 'id': 0, 'label': 'hot desert climate'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q6583', 'id': 1, 'label': 'Sahara'}, {'type': 'INTERNAL', 'name_': 'Q208299', 'id': 2, 'label': 'Arabian Desert'}], 'links': [{'name_': 'P2564', 'source': 2, 'target': 0, 'label': 'Köppen climate classification'}, {'name_': 'P1889', 'source': 2, 'target': 1, 'label': 'different from'}]}