Question: when did murdoch buy the wall street journal
[{'answer': 'on August 1 , 2007', 'provenance': [{'wikipedia_id': '173070', 'title': 'The Wall Street Journal', 'start_paragraph_id': 26, 'start_character': 20, 'end_paragraph_id': 26, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::History.:News Corporation and News Corp.\n'}]}, {'provenance': [{'wikipedia_id': '173070', 'title': 'The Wall Street Journal', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 429, 'bleu_score': 0.9226596185977011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2587536499334370821}, 'section': 'Section::::History.:News Corporation and News Corp.\n'}]}]