Two women work on a tapestry.
Nobody is working.
Two women work contradicts nobody working.
exists e1 x1 x2.(on(e1,x2) & n_tapestry(x2) & Actor(e1,x1) & v_work(e1) & n_woman(x1) & card_eq_2(x1))
-exists e1 x1.(Actor(e1,x1) & v_work(e1) & n_person(x1))