Question: where was ariel before prospero set him free
[{'answer': 'the tree', 'provenance': [{'wikipedia_id': '19759769', 'title': 'Ariel (The Tempest)', 'start_paragraph_id': 1, 'start_character': 143, 'end_paragraph_id': 1, 'end_character': 151, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19759769', 'title': 'Ariel (The Tempest)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 577, 'bleu_score': 0.9802931511945101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7904967245597214081}, 'section': 'Section::::Abstract.'}]}]