A woman wearing a black hat grinds flour using two stones.
The woman wearing blue used a mixer to grind the flour.
Black is a different color than blue. A mixer is a mechanical tool while two stones are not mechanical.
exists e2 e1 p1 s1 x1 x2 x3 x4.(exists e3 x5.(Theme(e3,x5) & Actor(e3,x1) & v_use(e3) & n_stone(x5) & card_eq_2(x5)) & Topic(e2,p1) & Actor(e2,x1) & v_flour(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_grind(x3) & of(x3,x4) & n_hat(x4) & a_black(s1) & Theme(s1,x3) & (x1 = x2) & n_woman(x1))
exists e1 e2 p1 x1 x2 x3 x4.(n_flour(x4) & n_blue(x1) & Actor(e1,x1) & v_wear(e1) & of(x1,x2) & n_woman(x2) & Theme(e2,p1) & Recipient(e2,x3) & Actor(e2,x1) & v_use(e2) & exists e3.(Theme(e3,x4) & Actor(e3,x1) & v_grind(e3)) & n_mixer(x3))