Mary is either an advocate or a tipped employee.
Tipped employees do not get a guaranteed minimum wage. If a person is a white-collar worker, they will get a guaranteed minimum wage (All white-collar workers get a guaranteed minimum wage). All lawyers are white-collar workers. Every advocate is a lawyer. Mary is not a lawyer or a tipped employee.
∀x (Tipped(x) → ¬GetMinWage(x)) ∀x (WhiteCollar(x) → GetMinWage(x)) ∀x (Lawyer(x) → WhiteCollar(x)) ∀x (Advocate(x) → Lawyer(x)) ¬Lawyer(mary) ⊕ Tipped(mary)