Prove that: The points \( A(-1, 1) \), \( B(2, 5) \), \( C(4, 2) \) and \( D(5, 6) \) are the vertices of a parallelogram.
\( \overleftrightarrow{AB} \parallel \overleftrightarrow{CD} \)
\( \overleftrightarrow{AC} \parallel \overleftrightarrow{BD} \)
∴ The figure ABDC is a parallelogram
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