Question: when did pretty little liars first come out
[{'answer': 'June 8 , 2010', 'provenance': [{'wikipedia_id': '25857222', 'title': 'Pretty Little Liars', 'start_paragraph_id': 31, 'start_character': 35, 'end_paragraph_id': 31, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Release.:Broadcast.\n'}]}, {'provenance': [{'wikipedia_id': '25857222', 'title': 'Pretty Little Liars', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 451, 'bleu_score': 0.83540745186589, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1920775934758253372}, 'section': 'Section::::Abstract.'}]}]