Four men ride on the back of a dump truck.
These men are garbagemen
Not everyone who rides on a dump truck has to be a garbagemen.
exists e1 x1 x2 x3 x4.(n_back(x2) & on(e1,x2) & of(x2,x3) & n_truck(x3) & of(x3,x4) & n_dump(x4) & Actor(e1,x1) & v_ride(e1) & n_man(x1) & card_eq_4(x1))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_garbageman(x2)))