An older couple discusses a vegetable.
Three old people talk about sex.
couple is two and that is different from Three people.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_discuss(e1) & n_vegetable(x2) & n_couple(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(about(e1,x2) & n_sex(x2) & Actor(e1,x1) & v_talk(e1) & n_people(x1) & a_old(s1) & Theme(s1,x1) & card_eq_3(x1))