Two people performing at a music festival.
Two people are enjoying themselves.
All enjoying people are not performing at a music festival
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.(n_group(x2) & Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & n_people(x1) & card_eq_2(x1))