Two people with hard hats on standing on a brick wall.
No one is wearing protective gear.
Either two people are wearing hard hats or no one is wearing protective gear.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x2) & on(e1,x4) & n_wall(x4) & of(x4,x5) & n_brick(x5) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_hat(x2) & a_hard(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))
-exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_gear(x2) & a_protective(s1) & Theme(s1,x2) & n_one(x1))