Children enjoying themselves on an amusement park ride.
Kids are riding a roller coaster.
Not every amusement park ride is a roller coaster.
exists e1 x1 x2 x3 x4 x5 x6.(n_group(x3) & a_topic(x1) & on(e1,x4) & n_ride(x4) & of(x4,x6) & n_park(x6) & of(x4,x5) & n_amusement(x5) & Theme(e1,x3) & Actor(e1,x2) & v_enjoy(e1) & (x1 = x2) & n_child(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_coaster(x2) & of(x2,x3) & n_roller(x3) & n_kid(x1))