A male worker with a mask on his face.
A workman with a mask on.
A male worker is a workman with a mask on his face.
exists x1 x2 x3 x4.(a_topic(x1) & with(x1,x3) & on(x3,x4) & n_face(x4) & of(x4,x1) & n_male(x1) & n_mask(x3) & n_worker(x1) & of(x1,x2) & n_male(x2))
exists s1 x1 x2 x3.(a_topic(x1) & with(x1,x2) & Theme(s1,x3) & a_on(s1) & (x2 = x3) & n_mask(x2) & n_workman(x1))