- $\phi_1 = p \vee \neg p$, reszta obojętnie
  - $\phi_1 = p$, $\phi_2 = q$, $\phi_3 = r$
  - $\phi_1 = p \wedge \neg p$, $\phi_2 = q \wedge \neg q$, $\phi_3 = dowolne$