Many of the dishes contain rice.
Some dishes do not have rice.
Many dishes contain rice; however, some so not have rice.
exists e1 x1 x2 x3.(n_dish(x2) & Theme(e1,x3) & Actor(e1,x1) & v_contain(e1) & n_rice(x3) & of(x1,x2) & n_quantity(x1))
exists x1.(-exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_rice(x2)) & n_dish(x1))