\"\"

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The endpoints are \"\" and \"\".

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The midpoint of a segment with endpoints \"\" is \"\"

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\"\"      (Substitute  \"\")

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\"\"                  (Add: \"\")

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\"\"                           (Divide: \"\")

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The midpoint is \"\"

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\"\"

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The midpoint of the segment with endpoints \"\" and  \"\" is \"\".

\