A man and a child at a store checkout counter.
Nobody at a store.
A man and child implies more people than nobody.
exists s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & at(x2,x3) & n_counter(x3) & of(x3,x5) & n_checkout(x5) & of(x3,x4) & n_store(x4) & n_child(x2) & subset_of(x1,s1) & n_man(x1))
-exists x1 x2.(a_topic(x1) & at(x1,x2) & n_store(x2) & n_person(x1))