Question: what does hm stand for in the metric system
[{'answer': 'hectometre', 'provenance': [{'wikipedia_id': '566803', 'title': 'Hectometre', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'hectometer', 'provenance': [{'wikipedia_id': '566803', 'title': 'Hectometre', 'start_paragraph_id': 1, 'start_character': 118, 'end_paragraph_id': 1, 'end_character': 128, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '566803', 'title': 'Hectometre', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 476, 'bleu_score': 0.8198361650583451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5340889760307075233}, 'section': 'Section::::Abstract.'}]}]