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--- Learning, Studying
勉強 benkyō studying 強 [strong]  Ref. 勉 [effort]
練習 renshū practice { = exercise learning} 習 [learn]  Ref. 練 [exercise]
説明 setsumei explanation   Ref. 説 [explain]
学習 gakushū learning   Ref. 習 [learn]