An elderly checks out the samples.
The person is a teenager
One cannot be elderly and be a teenager.
exists s1 x1 x2.(n_sample(x2) & a_topic(x1) & out(x1,x2) & n_check(x1) & a_elderly(s1) & Theme(s1,x1))
exists p1 x1.(n_person(x1) & exists x2.((x1 = x2) & n_teenager(x2)))