Exercise 19.12 Suppose that we have the following four tuples in a relation S with three attributes ABC: (1,2,3), (4,2,3), (5,3,3), (5,3,4). Which of the following functional (→) and multivalued (→→) dependencies can you infer does not hold over relation S?
1. A → B
2. A →→ B
3. BC → A
4. BC →→ A
5. B → C
6. B →→ C
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