Three men work on a piece of equipment.
the men are fixing a truck
Just because a man is working on a piece of equipment doesn't mean they are fixing a truck
exists e1 x1 x2 x3.(on(e1,x2) & of(x2,x3) & n_equipment(x3) & n_piece(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_3(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fix(e1) & n_truck(x2))