A white man in a turban.
A man is at a costume party.
Because the man his wearing a costume doesn't mean his wearing a turban.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_turban(x2) & n_man(x1) & a_white(s1) & Theme(s1,x1))
exists p1 x1.(exists s1 x2.(at(x1,x2) & n_party(x2) & a_costume(s1) & Theme(s1,x2)) & n_man(x1))