Black people talking in the marketplace.
Everyone in the marketplace is silent.
People cannot talk while silent. Black people are a subset of everyone.
exists e1 x1 x2 x3 x4.(n_marketplace(x4) & a_topic(x1) & in(e1,x4) & Actor(e1,x3) & v_talk(e1) & (x1 = x3) & n_people(x1) & (x1 = x2) & ne_nam_black(x2))
exists x2.(n_marketplace(x2) & all x1.(n_person(x1) -> exists s1.(Theme(s1,x1) & a_silent(s1) & in(x1,x2))))