Question: who wrote the song puff the magic dragon
[{'answer': 'Leonard Lipton', 'provenance': [{'wikipedia_id': '158197', 'title': 'Puff, the Magic Dragon', 'start_paragraph_id': 1, 'start_character': 58, 'end_paragraph_id': 1, 'end_character': 72, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Peter Yarrow', 'provenance': [{'wikipedia_id': '158197', 'title': 'Puff, the Magic Dragon', 'start_paragraph_id': 1, 'start_character': 77, 'end_paragraph_id': 1, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '158197', 'title': 'Puff, the Magic Dragon', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 166, 'bleu_score': 0.8802730032659041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2321003551948457583}, 'section': 'Section::::Abstract.'}]}]