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1-  R(ABCD) FD'S ARE {AB->C ,C->D,D->EA ,DE->F,EF->B}

2-R(ABCD) FDS ARE { A->BC, CD->E, B->D,E-A}

3- R(ABCD) {AB-> CD,C->B,D->C}

 

 

Find the candidate key ??? For above questions and please explain  too.

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