Distant person riding off-road vehicle across sand dunes marked with treads.
A person rides a moving object outdoors.
if a person is riding an off-road vehicle across sand dunes the person is outdoors riding a moving object.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & across(e1,x4) & with(e2,x7) & n_tread(x7) & Theme(e2,x6) & v_mark(e2) & (x4 = x6) & n_dune(x4) & of(x4,x5) & n_sand(x5) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_vehicle(x3) & a_off-road(s2) & Theme(s2,x3) & (x1 = x2) & n_person(x1) & a_distant(s1) & Theme(s1,x1))
exists e1 e2 x1 x2 x3.(Theme(e2,x2) & Actor(e2,x1) & v_ride(e2) & n_outdoors(x2) & of(x2,x3) & n_object(x3) & Actor(e1,x2) & v_move(e1) & n_person(x1))