A man walking in front of a building with graffiti on it.
A man is looking for the artist who wrote the graffiti.
Walking in front of a building with graffiti on it does not imply that the man is looking for the artist who wrote the graffiti.
exists x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x3) & on(x3,x1) & n_thing(x1) & of(x3,x4) & with(x4,x5) & n_graffitus(x5) & n_building(x4) & n_front(x3) & n_walking(x1) & of(x1,x2) & n_man(x2))
exists e1 e2 x1 x2 x3 x4.(n_graffitus(x4) & n_artist(x2) & for(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_write(e2) & (x2 = x3) & Actor(e1,x1) & v_look(e1) & n_man(x1))