Many people attending a seminar.
There are men and women at a seminar.
Not all people attending a seminar are men and women.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_attend(e1) & n_seminar(x3) & (x1 = x2) & n_people(x1) & n_quantity(x1))
exists p1 x1 x2.(at(p1,x2) & n_seminar(x2) & exists x3 x4 x5.((x1 = x3) & n_woman(x5) & n_man(x4) & subset_of(x5,x3) & subset_of(x4,x3)))