An old man sorts through doll parts.
The man is playing the piano at a rock concert.
The man either sorts or is playing.
exists s1 x1 x2 x3 x4.(a_topic(x1) & through(x1,x3) & n_part(x3) & of(x3,x4) & n_doll(x4) & n_sort(x1) & of(x1,x2) & n_man(x2) & a_old(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(n_piano(x2) & n_man(x1) & at(e1,x3) & n_concert(x3) & of(x3,x4) & n_rock(x4) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))