Some cows cluster together.
Some calves are together
Not all cows are calves.
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_cluster(e1) & n_cow(x1))
exists s1 x1.(Theme(s1,x1) & a_together(s1) & n_calf(x1))