A band performing on stage.
An orchestra playing in the football stadium.
playing on a stage is not the same as a football stadium.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_stage(x3) & Actor(e1,x2) & v_perform(e1) & (x1 = x2) & n_band(x1))
exists x1 x2 x3 x4.(n_stadium(x3) & of(x3,x4) & n_football(x4) & a_topic(x1) & in(x1,x3) & n_playing(x1) & of(x1,x2) & n_orchestra(x2))