A vendor on a busy street is selling food.
A vendor is selling hotdogs.
Not all vendors sell hotdogs.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_sell(e1) & n_food(x3) & on(x1,x2) & n_street(x2) & a_busy(s1) & Theme(s1,x2) & n_vendor(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_sell(e1) & n_hotdog(x2) & n_vendor(x1))