`(x-1)/(1)=(y-1)/(2)=(z-1)/(3)``(x-1)/(1)=(y-2)/(2)=(z-3)/(3)``(x-2)/(1)=(y-2)/(2)=(z-2)/(3)``(x-3)/(1)=(y-3)/(2)=(z-3)/(3)`
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