A group of people pull a jeep stuck on a rock.
a group of people are riding horses
People cannot be trying to pull a stuck jeep while riding horses
exists e1 e2 x1 x2 x3 x4 x5.(Theme(e2,x3) & Actor(e2,x1) & v_pull(e2) & on(e1,x5) & n_rock(x5) & Theme(e1,x4) & v_stick(e1) & (x3 = x4) & n_jeep(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_horse(x3) & of(x1,x2) & n_people(x2) & n_group(x1))