Question: which republican senate seats are up in 2018
[{'answer': 'Arizona', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 2, 'start_character': 534, 'end_paragraph_id': 2, 'end_character': 541, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Mississippi', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 1, 'start_character': 221, 'end_paragraph_id': 1, 'end_character': 232, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Nebraska', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 110, 'start_character': 11, 'end_paragraph_id': 110, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Montana.\n'}]}, {'answer': 'Nevada', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 3, 'start_character': 199, 'end_paragraph_id': 3, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Tennessee', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 2, 'start_character': 514, 'end_paragraph_id': 2, 'end_character': 523, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Texas', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 5, 'start_character': 92, 'end_paragraph_id': 5, 'end_character': 97, 'bleu_score': 1.0, 'section': 'Section::::Focus on competitive races.\n'}]}, {'answer': 'Utah', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 2, 'start_character': 525, 'end_paragraph_id': 2, 'end_character': 529, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Wyoming', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 179, 'start_character': 11, 'end_paragraph_id': 179, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Wisconsin.\n'}]}]