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Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar.P⁢Q¯ is parallel to R⁢S¯. P⁢R¯ and Q⁢S¯ are perpendicular to P⁢Q¯ and R⁢S¯.The ratio of the lengths of P⁢R¯ and Q⁢S¯ is : .

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