As you are driving to your friend’s new apartment, you realize that you forgot the address of the apartment building. You know that the apartment is north of his old apartment. As you drive down the street where his old apartment is, you begin looking at the signs: Azalea Drive, Oak Circle, Peach Tree Street, and Sycamore Drive. You remember that the apartment is on a Drive, not a street or circle, which narrows down the possibilities and illustrates your use of a(n) _________.