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You are graphing rectangle ABCDABCDA, B, C, D in the coordinate plane. The following are three of the vertices of the rectangle: A(2, 1), B(5, 1),A(2,1),B(5,1),A, left parenthesis, 2, comma, 1, right parenthesis, comma, B, left parenthesis, 5, comma, 1, right parenthesis, comma and C(5, 6)C(5,6)C, left parenthesis, 5, comma, 6, right parenthesis.
What are the coordinates of point DDD?