A boy playing in a mud puddle.
The boy is in the mud.
Playing in a mud puddle requires being in the mud.
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x3) & n_puddle(x3) & of(x3,x4) & n_mud(x4) & n_playing(x1) & of(x1,x2) & n_boy(x2))
exists p1 x1 x2.(n_mud(x2) & n_boy(x1) & in(x1,x2))