Question: when did abby cadabby first appear on sesame street
[{'answer': 'August 14 , 2006', 'provenance': [{'wikipedia_id': '4038350', 'title': 'Abby Cadabby', 'start_paragraph_id': 8, 'start_character': 29, 'end_paragraph_id': 8, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Character launch.\n'}]}, {'provenance': [{'wikipedia_id': '4038350', 'title': 'Abby Cadabby', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 44, 'bleu_score': 0.7860753021519781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11049698123628939511}, 'section': 'Section::::Character launch.\n'}]}]