Question: where does the expression on cloud nine come from
[{'answer': 'Its origin is unknown', 'provenance': [{'wikipedia_id': '143808', 'title': 'The whole nine yards', 'start_paragraph_id': 1, 'start_character': 261, 'end_paragraph_id': 1, 'end_character': 282, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '143808', 'title': 'The whole nine yards', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 405, 'bleu_score': 0.95065068042233, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 256520592936203326}, 'section': 'Section::::Abstract.'}]}]