Who was the second-to-last Republican mayor of Boston?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q29468', 'id': 0, 'label': 'Republican Party'}, {'type': 'INTERNAL', 'name_': 'Q771', 'id': 1, 'label': 'Massachusetts'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q100', 'id': 2, 'label': 'Boston'}, {'type': 'INTERNAL', 'name_': 'Q5083194', 'id': 3, 'label': 'Charles Wadleigh Eldridge'}, {'type': 'INTERNAL', 'name_': 'Q98925565', 'id': 4, 'label': '1917 Massachusetts legislature'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q3281706', 'id': 5, 'label': 'Malcolm Edwin Nichols'}], 'links': [{'name_': 'P36', 'source': 1, 'target': 2, 'label': 'capital'}, {'name_': 'P102', 'source': 3, 'target': 0, 'label': 'member of political party'}, {'name_': 'P19', 'source': 3, 'target': 2, 'label': 'place of birth'}, {'name_': 'P793', 'source': 3, 'target': 4, 'label': 'significant event'}, {'name_': 'P1001', 'source': 4, 'target': 1, 'label': 'applies to jurisdiction'}, {'name_': 'P710', 'source': 4, 'target': 3, 'label': 'participant'}, {'name_': 'P710', 'source': 4, 'target': 5, 'label': 'participant'}]}