Question: what type of front would cause several days of rain and clouds
[{'answer': 'Stationary', 'provenance': [{'wikipedia_id': '2188689', 'title': 'Weather front', 'start_paragraph_id': 19, 'start_character': 11, 'end_paragraph_id': 19, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Types.:Occluded front.\n'}]}, {'provenance': [{'wikipedia_id': '2188689', 'title': 'Weather front', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 451, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12584497873763270994}, 'section': 'Section::::Types.:Stationary front.\n'}]}]