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\(ABCD\) is a parallelogram. A circle through \(A, B\) is so drawn that it intersects \(AD\) at \(P\) and \(BC\) at \(Q\). Prove that \(P, Q, C\) and \(D\) are concyclic.
 
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This is a self assessment task. Solve this question and assess the solution steps after the completion of test on your own.