Children sitting in a classroom.
Adults sitting in a classroom.
Adults are not children.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_classroom(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_child(x1))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_classroom(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_adult(x1))