A guitar band is playing on stage.
A guitar band is running.
A guitar band can't be running and playing on stage.
exists e1 x1 x2 x3.(on(e1,x3) & n_stage(x3) & Actor(e1,x1) & v_play(e1) & n_band(x1) & of(x1,x2) & n_guitar(x2))
exists e1 x1 x2.(Actor(e1,x1) & v_run(e1) & n_band(x1) & of(x1,x2) & n_guitar(x2))