Question: when does rhoda leave the mary tyler moore show
[{'answer': 'after the fourth season', 'provenance': [{'wikipedia_id': '78217', 'title': 'The Mary Tyler Moore Show', 'start_paragraph_id': 15, 'start_character': 469, 'end_paragraph_id': 15, 'end_character': 492, 'bleu_score': 1.0, 'section': 'Section::::Characters.\n'}]}, {'provenance': [{'wikipedia_id': '78217', 'title': 'The Mary Tyler Moore Show', 'start_paragraph_id': 15, 'start_character': 30, 'end_paragraph_id': 15, 'end_character': 530, 'bleu_score': 0.9085753563536411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16692112074112410242}, 'section': 'Section::::Characters.\n'}]}]