An ensemble of children are playing classical instruments at a concert.
The children are playing at the concert.
The children are playing at the concert refers to children are playing classical instruments at a concert.
exists e1 s1 x1 x2 x3 x4.(at(e1,x4) & n_concert(x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_instrument(x3) & a_classical(s1) & Theme(s1,x3) & of(x1,x2) & n_child(x2) & n_ensemble(x1))
exists e1 x1 x2.(n_concert(x2) & n_child(x1) & at(e1,x2) & Actor(e1,x1) & v_play(e1))