Picture of a guy at a gas station.
Picture of theif
We do not know someone is a theif just by looking at them.
exists x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & at(x2,x3) & n_station(x3) & of(x3,x4) & n_gas(x4) & n_guy(x2) & n_picture(x1))
exists x1 x2.(a_topic(x1) & of(x1,x2) & n_theif(x2) & n_picture(x1))