Man with mask on raises hand.
Man with black mask on raises hand.
Just because man with mask on raises hand does not mean that he is a man with black mask
exists s1 x1 x2 x3 x4.(Time(s1,x4) & n_hand(x4) & with(s1,x2) & on(x2,x3) & n_raise(x3) & n_mask(x2) & Theme(s1,x1) & a_man(s1) & n_thing(x1))
exists s1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & on(x2,x3) & Time(x3,x4) & n_hand(x4) & n_raise(x3) & n_mask(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))