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Given triangle ABC with vertices A(-6, -2), B(2,8), and C(6, -2). Line AB has midpoint D, line BC has midpoint E, and line AC has midpoint F.
Which of the following statements is true?
1. ADEF is only a parallelogram
3. ADEF is a rectable but not a parallelogram
4. ADEF is not a parallelogram

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