Two people painting in a dirty room.
some people were painting,
Just because Two people painting in a dirty room does not necessary that some people were painting,
exists e1 x1 x2 x3.(in(e1,x2) & n_room(x2) & of(x2,x3) & n_dirty(x3) & Actor(e1,x1) & v_painting(e1) & n_people(x1) & card_eq_2(x1))
exists p1 x1.(exists x2.((x1 = x2) & n_painting(x2)) & n_people(x1))