Two men in white uniforms and blue helmets are playing on a ball field.
The men are not wearing helmets.
The men cannot both be wearing helmets and not wearing helmets.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(on(e1,x5) & n_field(x5) & of(x5,x6) & n_ball(x6) & Actor(e1,x1) & v_play(e1) & in(x1,x2) & subset_of(x4,x2) & n_helmet(x4) & a_blue(s2) & Theme(s2,x4) & subset_of(x3,x2) & n_uniform(x3) & a_white(s1) & Theme(s1,x3) & n_man(x1) & card_eq_2(x1))
exists x1.(n_man(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2)))