A young girl on Rollerblades.
A human on rollerblades.
A young girl is a human.
exists s1 x1 x2.(ne_org_rollerblades(x2) & a_topic(x1) & on(x1,x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_rollerblade(x2) & n_human(x1))