An old customer waits for his food from a vendor.
The customer is not a young person.
An old customer is not a young person.
exists s1 x1 x2 x3 x4.(a_topic(x1) & for(x1,x3) & from(x3,x4) & n_vendor(x4) & n_food(x3) & of(x3,x1) & n_male(x1) & n_wait(x1) & of(x1,x2) & n_customer(x2) & a_old(s1) & Theme(s1,x1))
exists x1.(n_customer(x1) & -exists p1 s1 x2.((x1 = x2) & n_person(x2) & a_young(s1) & Theme(s1,x2)))