Question: when does the afc west play the nfc west
[{'answer': '2018', 'provenance': [{'wikipedia_id': '7990664', 'title': 'NFL regular season', 'start_paragraph_id': 2, 'start_character': 1055, 'end_paragraph_id': 2, 'end_character': 1059, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]