珠算十段選手の掛算(両手弾き&解説あり) (Multiplication by Abacus with Both Hands) - YouTube
https://youtu.be/0_11-FZpc1c?t=45
弐寺皆伝の音がする
珠算十段選手の掛算(両手弾き&解説あり) (Multiplication by Abacus with Both Hands) - YouTube
https://youtu.be/0_11-FZpc1c?t=45
弐寺皆伝の音がする
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