A woman in a white dress is riding a bicycle.
The woman is riding a  horse.
she is either riding a horse or a bicycle
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x3) & in(x1,x2) & n_dress(x2) & a_white(s1) & Theme(s1,x2) & n_woman(x1))
exists e1 x1 x2.(n_woman(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2))