Live crabs for sale in a bin.
Live crabs not for sale
Live crabs should be ether or not for sale
exists s1 x1 x2 x3.(a_topic(x1) & for(x1,x2) & in(x2,x3) & n_bin(x3) & n_sale(x2) & n_crab(x1) & a_live(s1) & Theme(s1,x1))
exists x1.(ne_nam_live(x1) & -exists e1 x2.(for(e1,x2) & n_sale(x2) & Actor(e1,x1) & v_crab(e1)))