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\[\begin {array} {1 1} (a)\;\frac{2}{\sqrt {14}},\frac{3}{\sqrt {14}},\frac{1}{\sqrt {14}} & \quad (b)\;\frac{2}{\sqrt {14}},\frac{-3}{\sqrt {14}},\frac{1}{\sqrt {14}} \\ (c)\;\frac{-2}{\sqrt {14}},\frac{-3}{\sqrt {14}},\frac{1}{\sqrt {14}} & \quad (d)\;\frac{2}{\sqrt {14}},\frac{-3}{\sqrt {14}},\frac{-1}{\sqrt {14}} \end {array}\]

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