長方形:0<=X<=A, 0<=Y<=B
4刀: X=(1/3)A, X=(2/3)A; Y=(1/3)B, Y=(2/3)B.
長方形:0<=X<=A, 0<=Y<=B
4刀: X=(1/3)A, X=(2/3)A; Y=(1/3)B, Y=(2/3)B.
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