Question: when did lebron go back to the cavs
[{'answer': '2014', 'provenance': [{'wikipedia_id': '240940', 'title': 'LeBron James', 'start_paragraph_id': 3, 'start_character': 205, 'end_paragraph_id': 3, 'end_character': 209, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '240940', 'title': 'LeBron James', 'start_paragraph_id': 45, 'start_character': 0, 'end_paragraph_id': 45, 'end_character': 621, 'bleu_score': 0.91755601068918, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11121991566285841586}, 'section': 'Section::::Professional career.:Return to the Cavaliers.\n'}]}]