A competition among local food-catering providers.
There is no competition.
There is either competition or no competition among food-catering providers.
exists s1 s2 x1 x2.(a_topic(x1) & among(x1,x2) & n_provider(x2) & a_food-catering(s2) & Theme(s2,x2) & a_local(s1) & Theme(s1,x2) & n_competition(x1))
exists p1 x1.-exists x2.((x1 = x2) & n_competition(x2))