A band of two young adult boys performs on stage.
Two young men do an improve act on a stage.
There is nothing about the boys performing that indicates the nature of the performance, such as an improve act.
exists e1 s1 x1 x2 x3 x4.(on(e1,x4) & n_stage(x4) & Actor(e1,x1) & v_perform(e1) & of(x1,x2) & n_boy(x2) & of(x2,x3) & n_adult(x3) & a_young(s1) & Theme(s1,x2) & card_eq_2(x2) & n_band(x1))
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_stage(x3) & n_act(x2) & a_improve(s2) & Theme(s2,x2) & n_man(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))