A dark brown dog is looking at bubbles while walking on green grass.
A brown dog walks on the grass.
Grass is usually green, so the word grass implies that it is the color green.
exists e1 e2 s1 s2 s3 x1 x2 x3.(while(e1,e2) & on(e2,x3) & n_grass(x3) & a_green(s3) & Theme(s3,x3) & Actor(e2,x1) & v_walk(e2) & at(e1,x2) & n_bubble(x2) & Actor(e1,x1) & v_look(e1) & n_dog(x1) & a_brown(s2) & Theme(s2,x1) & a_dark(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_grass(x2) & on(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))