Question: what are the two breeds which were crossed to make the columbia
[{'answer': 'Lincoln rams', 'provenance': [{'wikipedia_id': '14896295', 'title': 'Columbia sheep', 'start_paragraph_id': 2, 'start_character': 39, 'end_paragraph_id': 2, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Rambouillet ewes', 'provenance': [{'wikipedia_id': '14896295', 'title': 'Columbia sheep', 'start_paragraph_id': 2, 'start_character': 70, 'end_paragraph_id': 2, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14896295', 'title': 'Columbia sheep', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 402, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9713399525076491164}, 'section': 'Section::::Abstract.'}]}]