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2. Given R (a, b, c, d, e, f, s). There are two keys: (a, b) and d. Given the following functional dependency: F =
2. Given R (a, b, c, d, e, f, s). There are two keys: (a, b) and d. Given the following functional dependency: F = {{a, b} --> {c, d, e, f, s}, d --> {a, b, c, e, f, s}, a -> s}. Is R in 2nd normal form? Justify your answer.
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