How many witches were there in the Wizard of Oz?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q130295', 'id': 0, 'label': 'The Wonderful Wizard of Oz'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q3821514', 'id': 1, 'label': 'Good Witch of the North'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q193695', 'id': 2, 'label': 'The Wizard of Oz'}], 'links': [{'name_': 'P674', 'source': 0, 'target': 1, 'label': 'characters'}, {'name_': 'P4969', 'source': 0, 'target': 2, 'label': 'derivative work'}, {'name_': 'P144', 'source': 2, 'target': 0, 'label': 'based on'}]}