Question: what type of front has cold air moving into warm air
[{'answer': 'occluded front', 'provenance': [{'wikipedia_id': '2188689', 'title': 'Weather front', 'start_paragraph_id': 3, 'start_character': 16, 'end_paragraph_id': 3, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2188689', 'title': 'Weather front', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 656, 'bleu_score': 0.983804329702269, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6414936279255831286}, 'section': 'Section::::Types.:Occluded front.\n'}]}]