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To what size should Feng Zikai's paintings be copied?

Copy Feng Zikai's 70× 50 size drawing paper. According to the exhibition of Feng Zikai's personal paintings, the largest size is the vertical paper of "Red Leaf Girl Firewood Crossing the Mountain", with a size of 69×45cm and a copy paper size of 70× 50, which can meet at least 20 copies of Feng Zikai's works.