Three people sing into a microphone.
A trio of people sing into a microphone.
A trio is three people.
exists e1 x1 x2.(into(e1,x2) & n_microphone(x2) & Actor(e1,x1) & v_sing(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2 x3.(into(e1,x3) & n_microphone(x3) & Actor(e1,x1) & v_sing(e1) & of(x1,x2) & n_people(x2) & n_trio(x1))