- #1

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Given the relational scheme $R = (A, B, C, D)$ with the set of functional dependencies $F =\{AB \rightarrow C, \ BC \rightarrow D, \ CD \rightarrow A, \ AD \rightarrow B\}$.

1. Give all non-trivial dependencies that can be derived from F. Justify your derived dependencies.

2. What are the key candidates?

Could you explain to me what we have to do at 1 ? :unsure: