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(AB'CD' +A'BCD') + AB'C'D'+A'BC'D

CD' (AB'+ A'B) + C'D ( AB' + A'B)

(C'D+CD'). ( AB'+A'B)

(C XOR D) AND (A XOR B)

1 AND and 2 Exclusive OR's .Hence the circuit got manipulated to And and Exclusive-or gates only.

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