A group of children are playing while waiting for the bus.
Some old people in a car.
Children playing contradict from old people in a car.
exists e2 e1 x1 x2 x3.(n_bus(x3) & while(e1,e2) & for(e2,x3) & Actor(e2,x1) & v_wait(e2) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_child(x2) & n_group(x1))
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_car(x2) & n_people(x1) & a_old(s1) & Theme(s1,x1))