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I've already finished the course (twice), and learned these words (diagramme, nuances, sbutilites, revelent), but they are still grey for some reason.
Lingvistプレミアムプラン料金改定のお知らせ
Course change failed
Possible synonyms and wrong audio track (Spanish, French)
Free exercises to learn English
無料プラン内容改定のお知らせ
無料トライアル期間について
Will the Portuguese course ever return?