kids play ultimate Frisbee.
Kids are playing frisbee at the park.
Kids playing ultimate frisbee are not necessarily playing in the park.
exists e1 s1 x1 x2.(ne_per_frisbee(x2) & a_ultimate(s1) & Theme(s1,x2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))
exists e1 x1 x2 x3.(n_park(x3) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_frisbee(x2) & n_kid(x1))