Question: who are the 4 left on the voice 2018
[{'answer': 'Brynn Cartelli', 'provenance': [{'wikipedia_id': '56093849', 'title': 'The Voice (American season 14)', 'start_paragraph_id': 2, 'start_character': 17, 'end_paragraph_id': 2, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Britton Buchanan', 'provenance': [{'wikipedia_id': '56093849', 'title': 'The Voice (American season 14)', 'start_paragraph_id': 2, 'start_character': 414, 'end_paragraph_id': 2, 'end_character': 430, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Kyla Jade', 'provenance': [{'wikipedia_id': '56093849', 'title': 'The Voice (American season 14)', 'start_paragraph_id': 39, 'start_character': 31, 'end_paragraph_id': 39, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Live Shows.:Week 4: Top 10 (May 7 & 8).\n'}]}, {'answer': 'Spensha Baker', 'provenance': [{'wikipedia_id': '56093849', 'title': 'The Voice (American season 14)', 'start_paragraph_id': 41, 'start_character': 510, 'end_paragraph_id': 41, 'end_character': 523, 'bleu_score': 1.0, 'section': 'Section::::Live Shows.:Week 5: Semifinals (May 14 & 15).\n'}]}]