two people looking at a computer.
Two people are watching tv.
They are either looking at a computer or a tv, not both.
exists e1 x1 x2.(at(e1,x2) & n_computer(x2) & Actor(e1,x1) & v_look(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_tv(x2) & n_people(x1) & card_eq_2(x1))