Question: what four states in the us form the northern border of mexico
[{'answer': 'California', 'provenance': [{'wikipedia_id': '2817606', 'title': 'Mexico–United States border', 'start_paragraph_id': 10, 'start_character': 57, 'end_paragraph_id': 10, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Geography.:Border states.\n'}]}, {'answer': 'Arizona', 'provenance': [{'wikipedia_id': '2817606', 'title': 'Mexico–United States border', 'start_paragraph_id': 10, 'start_character': 69, 'end_paragraph_id': 10, 'end_character': 76, 'bleu_score': 1.0, 'section': 'Section::::Geography.:Border states.\n'}]}, {'answer': 'New Mexico', 'provenance': [{'wikipedia_id': '2817606', 'title': 'Mexico–United States border', 'start_paragraph_id': 10, 'start_character': 78, 'end_paragraph_id': 10, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Geography.:Border states.\n'}]}, {'answer': 'Texas', 'provenance': [{'wikipedia_id': '2817606', 'title': 'Mexico–United States border', 'start_paragraph_id': 2, 'start_character': 200, 'end_paragraph_id': 2, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2817606', 'title': 'Mexico–United States border', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 213, 'bleu_score': 0.9402297675816911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15111465847216561133}, 'section': 'Section::::Geography.:Border states.\n'}]}]