What is the second longest river in Africa?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q15', 'id': 0, 'label': 'Africa'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q3542', 'id': 1, 'label': 'Niger River'}], 'links': [{'name_': 'P30', 'source': 1, 'target': 0, 'label': 'continent'}]}
The Niger River is in Africa.
The Niger River is a river in Africa .
What is the second longest river in Africa?</s>The [unused1]Niger River                [unused2] is in Africa.
What is the second longest river in Africa?</s>The Niger River is in Africa.
What is the second longest river in Africa?</s>The [unused1]Niger River                [unused2] is a river in Africa .
What is the second longest river in Africa?</s>The Niger River is a river in Africa .
What is the second longest river in Africa?</s>Africa,0,Africa,Africa,0,[unused1]Niger River[unused2],[unused1]Niger River[unused2],continent,Africa,[unused1]Niger River[unused2],0,[unused1]Niger River[unused2]
What is the second longest river in Africa?</s>Africa,0,Africa,Africa,0,Niger River,Niger River,continent,Africa,Niger River,0,Niger River