Two black men observe crops in a field.
men observing women
Men cannot being observing crops in a field and women at the same time.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_observe(e1) & in(x2,x3) & n_field(x3) & n_crop(x2) & n_man(x1) & a_black(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_observe(e1) & n_woman(x3) & (x1 = x2) & n_man(x1))