How many Apollo missions successful took crews to the Moon and back?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q19180675', 'id': 0, 'label': 'Small Brockhaus and Efron Encyclopedic Dictionary'}, {'type': 'INTERNAL', 'name_': 'Q1138524', 'id': 1, 'label': 'Paulys Realenzyklopädie der klassischen Altertumswissenschaft'}, {'type': 'INTERNAL', 'name_': 'Q39', 'id': 2, 'label': 'Switzerland'}, {'type': 'INTERNAL', 'name_': 'Q19652', 'id': 3, 'label': 'public domain'}, {'type': 'INTERNAL', 'name_': 'Q8502', 'id': 4, 'label': 'mountain'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q405', 'id': 5, 'label': 'Moon'}, {'type': 'INTERNAL', 'name_': 'Q83223', 'id': 6, 'label': 'Asclepius'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q37340', 'id': 7, 'label': 'Apollo'}, {'type': 'INTERNAL', 'name_': 'Q15198209', 'id': 8, 'label': 'Belchenflue'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q463956', 'id': 9, 'label': 'Belenus'}, {'type': 'INTERNAL', 'name_': 'Q27330326', 'id': 10, 'label': 'Apollostrasse'}, {'type': 'INTERNAL', 'name_': 'Q19999298', 'id': 11, 'label': 'Belinus (Pauly-Wissowa)'}], 'links': [{'name_': 'P6216', 'source': 0, 'target': 3, 'label': 'copyright status'}, {'name_': 'P1343', 'source': 4, 'target': 0, 'label': 'described by source'}, {'name_': 'P1343', 'source': 5, 'target': 0, 'label': 'described by source'}, {'name_': 'P376', 'source': 5, 'target': 5, 'label': 'located on astronomical body'}, {'name_': 'P1343', 'source': 6, 'target': 0, 'label': 'described by source'}, {'name_': 'P1343', 'source': 6, 'target': 1, 'label': 'described by source'}, {'name_': 'P22', 'source': 6, 'target': 7, 'label': 'father'}, {'name_': 'P17', 'source': 8, 'target': 2, 'label': 'country'}, {'name_': 'P31', 'source': 8, 'target': 4, 'label': 'instance of'}, {'name_': 'P138', 'source': 8, 'target': 9, 'label': 'named after'}, {'name_': 'P17', 'source': 10, 'target': 2, 'label': 'country'}, {'name_': 'P138', 'source': 10, 'target': 7, 'label': 'named after'}, {'name_': 'P361', 'source': 11, 'target': 1, 'label': 'part of'}, {'name_': 'P6216', 'source': 11, 'target': 3, 'label': 'copyright status'}, {'name_': 'P921', 'source': 11, 'target': 9, 'label': 'main subject'}]}