Children enjoying themselves on an amusement park ride.
Children are going on multiple roller coasters
Not all amusement park rides are multiple roller coasters.
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 s1 x1 x2 x3.(on(e1,x2) & n_coaster(x2) & of(x2,x3) & n_roller(x3) & a_multiple(s1) & Theme(s1,x2) & Actor(e1,x1) & v_go(e1) & n_child(x1))