$\"\"$

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The vector is $\"\"$ .

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Observe the diagram:

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The vector $\"\"$ is from $\"\"$ to $\"\"$ .

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The vector $\"\"$ is from $\"\"$ to $\"\"$ .

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Diagram: \ \

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$\"\"$ . \ \

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$\"\"$

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The vector $\"\"$ is

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$\"\"$ .