A woman in a black miniskirt riding an orange bike.
There is a woman on a bike.
One typically has to be on a bike to be riding it; since a woman is riding a bike, then obviously there is a woman.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & of(x4,x5) & n_orange(x5) & (x1 = x3) & in(x1,x2) & n_miniskirt(x2) & a_black(s1) & Theme(s1,x2) & n_woman(x1))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_bike(x3) & n_woman(x2))