やんやん @yang8
CEO of Lang-8, Inc. Lang-8 is a social language learning service. You can teach your native language and learn from natives. Official account is @lang8
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Lang-8の新年メールの感想まとめ
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無駄に上がる期待値
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Funnelについて
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mention無しで会話が成立する方達
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yang8のダイエット宣言
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