a african-american woman stands in the crowd.
A black woman stands alone.
One can not stand alone and be in the crowd simultaneously.
exists s1 x1 x2 x3.(n_crowd(x3) & a_topic(x1) & in(x1,x3) & n_stand(x1) & of(x1,x2) & n_woman(x2) & a_african-american(s1) & Theme(s1,x1))
exists e1 s1 s2 x1.(a_alone(s2) & Manner(e1,s2) & Actor(e1,x1) & v_stand(e1) & n_woman(x1) & a_black(s1) & Theme(s1,x1))