A dark-skinned security officer smiles.
A security officer is angry and scowling.
Smiles is not the same as angry and scowling.
exists e1 s1 x1 x2.(Actor(e1,x1) & v_smile(e1) & n_officer(x1) & of(x1,x2) & n_security(x2) & a_dark-skinned(s1) & Theme(s1,x1))
exists s1 s2 x1 x2 x3 x4.(a_topic(s1) & subset_of(x4,s1) & n_scowling(x4) & subset_of(x1,s1) & Theme(s2,x3) & a_angry(s2) & (x1 = x3) & n_officer(x1) & of(x1,x2) & n_security(x2))