A wakeboarder in the ocean is in the middle of a flip.
A person is at the beach for the day
A wakeboarder in the ocean is in the middle of a flip does not imply he is at the beach for the day
exists p1 x1 x2 x3.(n_middle(x3) & n_ocean(x2) & exists x4.(in(x1,x3) & of(x3,x4) & n_flip(x4)) & in(x1,x2) & n_wakeboarder(x1))
exists p1 x1 x2 x3.(n_day(x2) & n_beach(x3) & for(p1,x2) & at(x1,x3) & n_person(x1))