A white boy and black boy embrace.
The children are hugging.
Two boys indicates children, and hugging means to embrace.
exists s1 s2 s3 x1 x2 x3.(a_topic(s1) & n_embrace(x2) & of(x2,x3) & n_boy(x3) & a_black(s3) & Theme(s3,x2) & n_boy(x1) & subset_of(x2,s1) & subset_of(x1,s1) & a_white(s2) & Theme(s2,s1))
exists e1 x1.(n_child(x1) & Actor(e1,x1) & v_hug(e1))