Two workers working on the gulf.
Two people working on an oil platform in the gulf.
The workers working on the gulf may not be on an oil platform.
exists e1 x1 x2.(n_gulf(x2) & on(e1,x2) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4 x5.(n_gulf(x5) & a_topic(x1) & on(e1,x3) & in(x3,x5) & n_platform(x3) & of(x3,x4) & n_oil(x4) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))