Young black girl riding pony at petting zoo.
There is a pony at the zoo.
If the girl is riding a pony at the zoo then the pony is at the zoo.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x5) & Actor(e1,x4) & v_pet(e1) & n_zoo(x5) & (x1 = x4) & n_pony(x1) & of(x1,x3) & n_riding(x3) & of(x1,x2) & n_girl(x2) & a_black(s2) & Theme(s2,x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1 x3.(n_zoo(x3) & exists x2.((x1 = x2) & at(x2,x3) & n_pony(x2)))