A person in a helmet on a motorcycle
A human in a helmet
Person is human.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & on(x2,x3) & n_motorcycle(x3) & n_helmet(x2) & n_person(x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_helmet(x2) & n_human(x1))