Two men are sitting working on their computers.
The men are co workers.
Not all men are sitting working on their computers are co workers.
exists e2 e1 x1 x2.(for(e1,e2) & on(e2,x2) & n_computer(x2) & of(x2,x1) & n_thing(x1) & Actor(e2,x1) & v_work(e2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_2(x1))
exists p1 x1.(n_man(x1) & exists s1 x2.((x1 = x2) & n_worker(x2) & a_co(s1) & Theme(s1,x2)))