A white dog running along side a river
a black dog walking home
there can be either a white dog or a black dog
exists e1 s1 x1 x2.(a_topic(x1) & all x3.(n_river(x3) -> exists x4.(along(e1,x4) & for(x4,x3) & n_side(x4))) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1) & a_white(s1) & Theme(s1,x1))
exists s1 x1 x2 x3.(a_topic(x1) & n_home(x1) & of(x1,x3) & n_walking(x3) & of(x1,x2) & n_dog(x2) & a_black(s1) & Theme(s1,x1))