A rollerblader riding a handrail.
A female rollerblader is on a handrail
A rollerblader is not necessarily female.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_handrail(x3) & (x1 = x2) & n_rollerblader(x1))
exists p1 s1 x1.(exists x2.(on(x1,x2) & n_handrail(x2)) & n_rollerblader(x1) & a_female(s1) & Theme(s1,x1))