Two workers working on the gulf.
There are two people.
Two workers are more generally speaking also two people.
exists e1 x1 x2.(n_gulf(x2) & on(e1,x2) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & card_eq_2(x1))
exists p1 x1 x2.((x1 = x2) & n_people(x2) & card_eq_2(x2))