What is the second longest river in Europe?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q46', 'id': 0, 'label': 'Europe'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q548', 'id': 1, 'label': 'Vistula'}], 'links': [{'name_': 'P30', 'source': 1, 'target': 0, 'label': 'continent'}]}
Vistula is a continent in Europe.
The region of Vistula is part of Europe .
What is the second longest river in Europe?</s> [unused1]Vistula                [unused2] is a continent in Europe.
What is the second longest river in Europe?</s>Vistula is a continent in Europe.
What is the second longest river in Europe?</s>The region of [unused1]Vistula                [unused2] is part of Europe .
What is the second longest river in Europe?</s>The region of Vistula is part of Europe .
What is the second longest river in Europe?</s>Europe,0,Europe,Europe,0,[unused1]Vistula[unused2],[unused1]Vistula[unused2],continent,Europe,[unused1]Vistula[unused2],0,[unused1]Vistula[unused2]
What is the second longest river in Europe?</s>Europe,0,Europe,Europe,0,Vistula,Vistula,continent,Europe,Vistula,0,Vistula