Question: when does olivia remember peter in season 4
[{'answer': '12', 'provenance': [{'wikipedia_id': '32140876', 'title': 'Fringe (season 4)', 'start_paragraph_id': 1, 'start_character': 144, 'end_paragraph_id': 1, 'end_character': 146, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]