White-haired man works on sculpture.
Black-haired man works on sculpture.
The man can't be both white-haired and black-haired.
exists e1 s1 x1 x2.(on(e1,x2) & n_sculpture(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & a_white-haired(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_sculpture(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & a_black-haired(s1) & Theme(s1,x1))