Bikers race through a forest.
Bikers are outdoors
Bikers race through a forest, therfore they are outdoors.
exists x1 x2 x3.(a_topic(x1) & through(x1,x3) & n_forest(x3) & n_race(x1) & of(x1,x2) & n_biker(x2))
exists p1 x1.(exists x2.((x1 = x2) & n_outdoors(x2)) & n_biker(x1))