Question: the ccc bond angle in allene (h2ccch2) is
[{'answer': '180 °', 'provenance': [{'wikipedia_id': '2762', 'title': 'Allene', 'start_paragraph_id': 4, 'start_character': 215, 'end_paragraph_id': 4, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Structure and bonding.:Geometry.\n'}]}, {'provenance': [{'wikipedia_id': '2762', 'title': 'Allene', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 362, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10596282766527116735}, 'section': 'Section::::Structure and bonding.:Geometry.\n'}]}]