Question: four colonies that were joined to form the union of south africa
[{'answer': 'Cape', 'provenance': [{'wikipedia_id': '44555', 'title': 'Union of South Africa', 'start_paragraph_id': 1, 'start_character': 168, 'end_paragraph_id': 1, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Natal', 'provenance': [{'wikipedia_id': '44555', 'title': 'Union of South Africa', 'start_paragraph_id': 1, 'start_character': 185, 'end_paragraph_id': 1, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Transvaal', 'provenance': [{'wikipedia_id': '44555', 'title': 'Union of South Africa', 'start_paragraph_id': 1, 'start_character': 203, 'end_paragraph_id': 1, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Orange River', 'provenance': [{'wikipedia_id': '44555', 'title': 'Union of South Africa', 'start_paragraph_id': 1, 'start_character': 222, 'end_paragraph_id': 1, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]