Two girls play trombone and a boy plays the saxophone.
people are playing instuments.
The trombone and saxophone are instruments.
exists e2 e1 x1 x2 x3 x4.(n_saxophone(x4) & Theme(e2,x4) & Actor(e2,x3) & v_play(e2) & n_boy(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_trombone(x2) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instument(x2) & n_people(x1))