Question: when does ally appear in pretty little liars
[{'answer': 'the pilot episode', 'provenance': [{'wikipedia_id': '28403064', 'title': 'Alison DiLaurentis', 'start_paragraph_id': 16, 'start_character': 229, 'end_paragraph_id': 16, 'end_character': 246, 'bleu_score': 1.0, 'section': 'Section::::Character on screen.:Story lines.:Season 1.\n'}]}, {'provenance': [{'wikipedia_id': '28403064', 'title': 'Alison DiLaurentis', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 914, 'bleu_score': 0.706321573725457, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8626485338436503744}, 'section': 'Section::::Character on screen.:Story lines.:Season 1.\n'}]}]