Question: the primary ethnic factional groups fighting each other in iraq after the invasion were
[{'answer': 'Arab Sunni', 'provenance': [{'wikipedia_id': '2372429', 'title': 'Sectarian violence in Iraq (2006–2008)', 'start_paragraph_id': 18, 'start_character': 51, 'end_paragraph_id': 18, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Ethno-sectarian composition.\n'}]}, {'answer': 'Arab Shia', 'provenance': [{'wikipedia_id': '2372429', 'title': 'Sectarian violence in Iraq (2006–2008)', 'start_paragraph_id': 18, 'start_character': 66, 'end_paragraph_id': 18, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Ethno-sectarian composition.\n'}]}, {'provenance': [{'wikipedia_id': '2372429', 'title': 'Sectarian violence in Iraq (2006–2008)', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 469, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13218006852605630716}, 'section': 'Section::::Ethno-sectarian composition.\n'}]}]