The U.S. State Department calls Japanese the Hardest Language to Learn. Why?
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最も難しい筆記体系! - 日本語を学ぶアニメ
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なぜ日本語が最も難しい言語なのか
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日本語が学ぶのが最も難しく、また最も簡単な言語である理由
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The reason it's said Japanese is the most difficult language? 【日本語が最も難しい言語と言われている理由?】
世界で最も難しい漢字を書いてみた
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