A child is hanging upside down on a ladder while another child is swinging from a rope.
Kids running in a field.
One cannot be running and hanging upside down simultaneously.
exists e1 p1 p2 x1.(exists e2 x3 x4.(from(e2,x4) & n_rope(x4) & Actor(e2,x3) & v_swing(e2) & n_child(x3) & -(x3 = x1)) & n_child(x1) & n_child(x1) & while(e1,p2) & exists s1 x2.(r_upside(s1) & on(s1,x2) & n_ladder(x2) & Theme(s1,x1) & a_down(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_hang(e1))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_field(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_kid(x1))