        selected=prepared['selected'];check('按地区与生效日期仅选N2',[r['id'] for r in selected]==['N2']);check('模型遵守当前政策',output.get('days')==14 and output.get('sources')==['N2']);check('同上传时间不能唯一确定版本',len({r['uploaded'] for r in original['policies']})==1);artifacts.append('selected-policy.json');result={'selection':selected,'answer':output}
