Question: what powers did a tribune allow the plebeians to exercise
[{'answer': 'summon the senate', 'provenance': [{'wikipedia_id': '1413432', 'title': 'Tribune of the Plebs', 'start_paragraph_id': 1, 'start_character': 400, 'end_paragraph_id': 1, 'end_character': 417, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'propose legislation', 'provenance': [{'wikipedia_id': '1413432', 'title': 'Tribune of the Plebs', 'start_paragraph_id': 1, 'start_character': 422, 'end_paragraph_id': 1, 'end_character': 441, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'intervene on behalf of plebeians in legal matters'}, {'answer': "convene and preside over the Concilium Plebis , or people 's assembly"}, {'answer': 'power to veto the actions of the consuls and other magistrates'}, {'provenance': [{'wikipedia_id': '1413432', 'title': 'Tribune of the Plebs', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1012, 'bleu_score': 0.934696781975176, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1938968444810729641}, 'section': 'Section::::Abstract.'}]}]