A group of friends smile for a picture at the beach.
The friends are angry.
friends cant smile and be angry
exists e1 x1 x2 x3 x4.(n_beach(x4) & for(e1,x3) & at(x3,x4) & n_picture(x3) & Actor(e1,x1) & v_smile(e1) & of(x1,x2) & n_friend(x2) & n_group(x1))
exists s1 x1.(n_friend(x1) & Theme(s1,x1) & a_angry(s1))