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4. Given this structure, transform the following statements into logical expressions. U: the set of all employees. H(x): x was hired. F(x): x was fired.

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4. Given this structure, transform the following statements into logical expressions. U: the set of all employees. H(x): x was hired. F(x): x was fired. P(x): x was promoted. (a) At least one employee was not promoted. (b) At least two employees were hired. (c) Exactly one employee was fired. (d) Everyone who is promoted is not fired

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