A band performs on stage.
There is no one on the stage.
one is about a band performing on stage while the other no on is on stage
exists e1 x1 x2.(on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_perform(e1) & n_band(x1))
exists p1 x1 x3.(n_stage(x3) & -exists x2.((x1 = x2) & on(x2,x3) & n_one(x2)))