Two dogs meeting on the beach.
Two cats playing.
dogs  is not the same as cats
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_meet(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_cat(x1) & card_eq_2(x1))