Question: when did the nba and the aba merge
[{'answer': '1976', 'provenance': [{'wikipedia_id': '20222830', 'title': 'ABA–NBA merger', 'start_paragraph_id': 1, 'start_character': 160, 'end_paragraph_id': 1, 'end_character': 164, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20222830', 'title': 'ABA–NBA merger', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 362, 'bleu_score': 0.852135830993155, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3765863791536141439}, 'section': 'Section::::Abstract.'}]}]