Three guys on stage, one of whom has a guitar and another a keyboard.
Some musicians are on a stage.
The three guys are musicians
exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(Theme(e1,x5) & Actor(e1,x4) & v_have(e1) & subset_of(x7,x5) & Time(x7,x8) & n_another(x8) & n_keyboard(x7) & subset_of(x6,x5) & n_guitar(x6) & of(x4,x3) & n_one(x4) & a_topic(x1) & (x1 = x3) & on(x1,x2) & n_stage(x2) & n_guy(x1) & card_eq_3(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_stage(x2)) & n_musician(x1))