A small boy playing with a wheel.
A small person playing with a wheel.
A boy is a person. So, a person playing with a wheel could be a small boy.
exists s1 x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_wheel(x3) & n_playing(x1) & of(x1,x2) & n_boy(x2) & a_small(s1) & Theme(s1,x1))
exists s1 x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_wheel(x3) & n_playing(x1) & of(x1,x2) & n_person(x2) & a_small(s1) & Theme(s1,x1))