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https://support.google.com/edu/classroom/thread/323636390/%EF%BC%A8%EF%BD%8F%EF%BD%97-%EF%BD%8D%EF%BD%81%EF%BD%8E%EF%BD%99-%EF%BD%82%EF%BD%81%EF%BD%87%EF%BD%93-%EF%BD%83%EF%BD%81%EF%BD%8E-%EF%BD%99%EF%BD%8F%EF%BD%95-%EF%BD%83%EF%BD%81%EF%BD%92%EF%BD%92%EF%BD%99-%EF%BD%97%EF%BD%89%EF%BD%94%EF%BD%88-%EF%BC%A5%EF%BC%B6%EF%BC%A1-%EF%BC%A1%EF%BD%89%EF%BD%92%EF%BC%9F\