Teenage dancers perform at a competition.
Two old men are playing chess in the park.
An old man cannot be a teenager.
exists e1 x1 x2 x3.(at(e1,x3) & n_competition(x3) & Actor(e1,x1) & v_perform(e1) & n_dancer(x1) & (x1 = x2) & ne_nam_teenage(x2))
exists e1 s1 x1 x2 x3.(n_park(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_chess(x2) & n_man(x1) & a_old(s1) & Theme(s1,x1) & card_eq_2(x1))