A little girl hugs another little girl.
A girl is hugging her sister.
A little girl hugs another little girl does not necessary that she is hugging her sister.
exists e1 s1 s2 s3 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hug(e1) & n_girl(x2) & a_little(s3) & Theme(s3,x2) & -(x2 = x1) & n_girl(x1) & n_girl(x1) & a_little(s2) & Theme(s2,x1) & a_little(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hug(e1) & n_sister(x2) & of(x2,x1) & n_female(x1) & n_girl(x1))