Two girls riding an ATV.
Two females are on a vehicle
Girls are females, and an ATV is a vehicle.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & ne_org_atv(x3) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_vehicle(x2)) & n_female(x1) & card_eq_2(x1))