Two people performing at a music festival.
One person playing alone.
It is either two people performing or just one, it cannot be both at the same time.
exists e1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x3) & n_festival(x3) & of(x3,x4) & n_music(x4) & Actor(e1,x2) & v_perform(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(a_topic(x1) & r_alone(x1) & Actor(e1,x2) & v_playing(e1) & (x1 = x2) & n_person(x1) & card_eq_1(x1))