a dirt biker stands in the sunset.
A bicyclist watches the sunrise.
Sunset is not sunrise.
exists e1 x1 x2 x3.(n_sunset(x3) & in(e1,x3) & Actor(e1,x1) & v_stand(e1) & n_biker(x1) & of(x1,x2) & n_dirt(x2))
exists e1 x1 x2.(n_sunrise(x2) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_bicyclist(x1))