Question: what does opie s stand for in baseball stats
[{'answer': 'On - base plus slugging', 'provenance': [{'wikipedia_id': '12931839', 'title': 'List of Major League Baseball career OPS leaders', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12931839', 'title': 'List of Major League Baseball career OPS leaders', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 254, 'bleu_score': 0.9560167778278961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5265358158358143210}, 'section': 'Section::::Abstract.'}]}]