A band of four guitarists and a drummer perform on stage.
A band of five singers perform on stage.
The group cannot be both four and five.
exists e1 x1 x2 x3 x4 x5.(on(e1,x5) & n_stage(x5) & Actor(e1,x1) & v_perform(e1) & subset_of(x4,x1) & n_drummer(x4) & subset_of(x2,x1) & of(x2,x3) & n_guitarist(x3) & card_eq_4(x3) & n_band(x2))
exists e1 x1 x2 x3.(on(e1,x3) & n_stage(x3) & Actor(e1,x1) & v_perform(e1) & of(x1,x2) & n_singer(x2) & card_eq_5(x2) & n_band(x1))