Three people singing together.
4 people singing.
Three and 4 are different amounts of people.
exists e1 p1 x1 x2.(a_topic(x1) & exists s1.(Theme(s1,x2) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x2) & v_sing(e1) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_sing(e1) & (x1 = x2) & n_people(x1) & n_date(x1) & a_date_day_04(x1) & a_date_day_04(x1))