Question: ( a ) [ 1 4 points ] Consider the relation schema R ( W , X , Y , Z ) with the functional

(a)[14 points] Consider the relation schema R(W,X,Y,Z) with the functional dependencies F={X -> Y,YZ -> W,W -> Z} and G ={X -> YZ,Y -> W,W -> Z,Z -> Y}.
(1)[7 points] Explain why the two sets F and G are not equivalent by calculating the attribute closures with respect to each set. Explain your answer in detail.

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