A group of people hanging upside down on a roller coaster.
People riding a roller coaster.
The act of hanging upside down on a roller coaster implies that the people are riding the roller coaster.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & r_upside(e1) & on(e1,x4) & n_coaster(x4) & of(x4,x5) & n_roller(x5) & r_down(e1) & Actor(e1,x3) & v_hang(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_coaster(x3) & of(x3,x4) & n_roller(x4) & (x1 = x2) & n_people(x1))