A group of tourists enjoy a fast flying amusement ride.
The ride is a roller coaster.
Just because it is a fast flying amusement ride does not mean it is a roller coaster.
exists e2 e1 s1 s2 x1 x2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_enjoy(e2) & n_ride(x3) & a_amusement(s2) & Theme(s2,x3) & Actor(e1,x3) & v_fly(e1) & a_fast(s1) & Theme(s1,x3) & of(x1,x2) & n_tourist(x2) & n_group(x1))
exists p1 x1.(n_ride(x1) & exists x2 x3.((x1 = x2) & n_coaster(x2) & of(x2,x3) & n_roller(x3)))