a girl and a woman ride a camel.
A girl and a woman are riding a horse.
A horse is different from a camel.
exists s1 x1.(a_topic(s1) & all x2.(n_camel(x2) -> exists x3 x4.(subset_of(x3,s1) & for(x3,x2) & n_ride(x3) & of(x3,x4) & n_woman(x4))) & subset_of(x1,s1) & n_girl(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & n_horse(x4) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_girl(x2))