A young girl plays guitar by pink walls.
She is playing a banjo.
A guitar and banjo are two different string instruments.
exists e1 s1 s2 x1 x2 x3.(by(e1,x3) & n_wall(x3) & a_pink(s2) & Theme(s2,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_female(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_banjo(x2))