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北魏→東魏→北斉(柔然を投降させる) 西魏→北周(道教 仏教弾圧 富国強兵策)→ 隋(外戚の楊堅が国奪う)
世界史
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO? Memorize
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