A person in a helmet rides a four-wheel vehicle in the desert.
A man and his dog is out running in the desert.
If the person is in a vehicle then they cannot be running at the same time.
exists e1 s1 x1 x2 x3 x4.(n_desert(x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & in(x3,x4) & n_vehicle(x3) & a_four-wheel(s1) & Theme(s1,x3) & in(x1,x2) & n_helmet(x2) & n_person(x1))
exists e1 s1 x1 x2 x3 x4.(n_desert(x4) & a_out(s1) & Manner(e1,s1) & in(e1,x4) & Actor(e1,x1) & v_run(e1) & subset_of(x3,x1) & n_dog(x3) & of(x3,x2) & n_male(x2) & subset_of(x2,x1) & n_man(x2))