A quad sends dirt flying into the air.
The four wheeler is floating over the snowbank.
A quad is a four wheeler but it cannot float over the snowbank and send dirt flying into the air at the same time.
exists e1 e2 x1 x2 x3.(n_air(x3) & for(e1,e2) & into(e2,x3) & Actor(e2,x1) & v_fly(e2) & Theme(e1,x2) & Actor(e1,x1) & v_send(e1) & n_dirt(x2) & n_quad(x1))
exists e1 x1 x2.(n_snowbank(x2) & n_wheeler(x1) & card_eq_4(x1) & over(e1,x2) & Actor(e1,x1) & v_float(e1))