Numerous workers with blue shirts and white aprons are preparing fish for sale.
Nobody is preparing.
Workers cannot be preparing fish if nobody is preparing.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5 x6.(for(e1,x6) & n_sale(x6) & Theme(e1,x5) & Actor(e1,x1) & v_prepare(e1) & n_fish(x5) & with(x1,x2) & subset_of(x4,x2) & n_apron(x4) & a_white(s3) & Theme(s3,x4) & subset_of(x3,x2) & n_shirt(x3) & a_blue(s2) & Theme(s2,x3) & n_worker(x1) & a_numerous(s1) & Theme(s1,x1))
-exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_prepare(e1) & n_thing(x2) & n_person(x1))