two men work on a piece of machinery.
One man is working on something.
two men is different from one man
exists e1 x1 x2 x3.(on(e1,x2) & of(x2,x3) & n_machinery(x3) & n_piece(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(on(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_1(x1))