Several brown dogs of different sizes gather together.
Cats hiss at each other.
Dogs who gather together aren't cats.
exists e1 p1 s1 s2 x1 x2 x3.(n_size(x3) & exists s3.(Theme(s3,x1) & a_together(s3)) & Topic(e1,p1) & Actor(e1,x1) & v_gather(e1) & of(x1,x2) & -(x2 = x3) & n_size(x2) & n_dog(x1) & a_brown(s2) & Theme(s2,x1) & a_several(s1) & Theme(s1,x1))
exists x1 x2.(all x3.(n_other(x3) -> (a_topic(x1) & at(x1,x3))) & n_hiss(x1) & of(x1,x2) & n_cat(x2))