Which writer asked his lifelong friend Max Brod to burn all his unpublished manuscripts?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q3927614', 'id': 0, 'label': 'Nazi book burnings'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q28480', 'id': 1, 'label': 'Max Brod'}], 'links': [{'name_': 'P793', 'source': 1, 'target': 0, 'label': 'significant event'}]}