Question: an edge that is between a vertex and itself is a
[{'answer': 'loop', 'provenance': [{'wikipedia_id': '1449083', 'title': 'Loop (graph theory)', 'start_paragraph_id': 1, 'start_character': 19, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': "loop ( also called a self - loop or a `` buckle '' )"}, {'provenance': [{'wikipedia_id': '1449083', 'title': 'Loop (graph theory)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 141, 'bleu_score': 0.929712191543383, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2985802203240380765}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1449083', 'title': 'Loop (graph theory)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['In graph theory, a loop (also called a self-loop or a "buckle") is an edge that connects a vertex to itself.', 'In graph theory, a loop (also called a self-loop or a "buckle") is an edge that connects a vertex to itself.']}}]}, {'provenance': [{'wikipedia_id': '1449083', 'title': 'Loop (graph theory)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['In graph theory, a loop (also called a self-loop or a "buckle") is an edge that connects a vertex to itself.', 'In graph theory, a loop (also called a self-loop or a "buckle") is an edge that connects a vertex to itself.']}}]}]