Question: what type of grid line forms the border between saskatchewan and manitoba
[{'answer': 'quadripoint', 'provenance': [{'wikipedia_id': '5634554', 'title': 'Quadripoint', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5634554', 'title': 'Quadripoint', 'start_paragraph_id': 33, 'start_character': 0, 'end_paragraph_id': 33, 'end_character': 881, 'bleu_score': 0.9858648355536391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7860907801102500953}, 'section': 'Section::::Quadripoints within and between nations.:Canada.\n'}]}]