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1.  A->B , B->CD                   : CK : A  . It is in 2NF

2. A->B , B->C , C->D           : CK : A  . It is in 2NF

3. AB->C , C->AD                  : CK : AB  . It is in 2NF

4. A->BCD                              : CK : A  . It is in BCNF

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