A little girl hugs another little girl.
The two girls are sisters.
Just because a girl hugs another girl, it does not mean they are sisters
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 p1 x1.(n_girl(x1) & card_eq_2(x1) & exists x2.((x1 = x2) & n_sister(x2)))