Question: which two countries are on the western border of bolivia
[{'answer': 'Chile', 'provenance': [{'wikipedia_id': '3462', 'title': 'Bolivia', 'start_paragraph_id': 2, 'start_character': 345, 'end_paragraph_id': 2, 'end_character': 350, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Peru', 'provenance': [{'wikipedia_id': '3462', 'title': 'Bolivia', 'start_paragraph_id': 2, 'start_character': 376, 'end_paragraph_id': 2, 'end_character': 380, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3462', 'title': 'Bolivia', 'start_paragraph_id': 2, 'start_character': 53, 'end_paragraph_id': 2, 'end_character': 628, 'bleu_score': 0.785669564968547, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4315763020156390431}, 'section': 'Section::::Abstract.'}]}]