Two construction workers in green helmets are at work.
Workers are wearing protective helmets.
Two construction workers are workers and green helmets are protective helmets.
exists p1 s1 x1 x2 x3.(exists x4.(at(x1,x4) & n_work(x4)) & in(x1,x3) & n_helmet(x3) & a_green(s1) & Theme(s1,x3) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2) & a_protective(s1) & Theme(s1,x2) & n_worker(x1))