two children are in front of a clown, with one throwing a ball.
Two old people in front of a clown.
Children and old people are different.
exists e1 p1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x2) & v_throw(e1) & n_ball(x3) & with(p1,x2) & n_thing(x2) & card_eq_1(x2) & exists x4 x5.(in(x1,x4) & of(x4,x5) & n_clown(x5) & n_front(x4)) & n_child(x1) & card_eq_2(x1))
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x2) & of(x2,x3) & n_clown(x3) & n_front(x2) & n_people(x1) & a_old(s1) & Theme(s1,x1) & card_eq_2(x1))