Question: how many syllables are in one line of iambic pentameter
[{'answer': 'usually contain ten syllables', 'provenance': [{'wikipedia_id': '1425527', 'title': 'Iambic pentameter', 'start_paragraph_id': 3, 'start_character': 30, 'end_paragraph_id': 3, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1425527', 'title': 'Iambic pentameter', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 106, 'bleu_score': 0.8852140475440831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7119934943710935365}, 'section': 'Section::::Abstract.'}]}]