A dirt biker in the forest.
A biker is in the forest
biker is a dirt biker
exists x1 x2 x3.(n_forest(x3) & a_topic(x1) & in(x1,x3) & n_biker(x1) & of(x1,x2) & n_dirt(x2))
exists p1 x1 x2.(n_forest(x2) & in(x1,x2) & n_biker(x1))