Question: who got relegated from the premiership in 2018
[{'answer': 'Swansea City', 'provenance': [{'wikipedia_id': '53122929', 'title': '2017–18 Premier League', 'start_paragraph_id': 13, 'start_character': 682, 'end_paragraph_id': 13, 'end_character': 694, 'bleu_score': 1.0, 'section': 'Section::::Overview.:Summary.\n'}]}, {'answer': 'Stoke City', 'provenance': [{'wikipedia_id': '53122929', 'title': '2017–18 Premier League', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Overview.:Summary.\n'}]}, {'answer': 'West Bromwich Albion', 'provenance': [{'wikipedia_id': '53122929', 'title': '2017–18 Premier League', 'start_paragraph_id': 9, 'start_character': 111, 'end_paragraph_id': 9, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Overview.:Summary.\n'}]}]