Question: A relation R(A,B,C,D,E) has exactly four superkeys: CDE, ACDE, BCDE and ABCDE. State the canddiate key(s). Please explain if you can.

A relation R(A,B,C,D,E) has exactly four superkeys: CDE, ACDE, BCDE and ABCDE. State the canddiate key(s). Please explain if you can.

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