Two guys breakdance on stage.
Two guys are sitting on the stage keeping everyone from dancing.
Two guys cannot be sitting and breakdancing at the same time.
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_stage(x3) & n_breakdance(x1) & of(x1,x2) & n_guy(x2) & card_eq_2(x1))
exists e1 x1 x2.(n_stage(x2) & all x3.(n_person(x3) -> exists e2 e3 x4.(for(e1,e2) & from(e2,e3) & Actor(e3,x4) & v_dance(e3) & Theme(e2,x3) & Actor(e2,x1) & v_keep(e2))) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_guy(x1) & card_eq_2(x1))