Inclusio
The ancient Hebrews authors loved inclusio. Inclusio is type of bracketing, or enveloping by placing similar material at the beginning and the end of a section.
Ancient Babylonian tablets which predate Abraham used bracketing as a way to indicate when an account was finished. This was necessary because clay tablets were small; a story may run across two or more tablets. Though the original tablets were transcribed on papyrus, they are still helpful to signify the contents in the literary envelope.
We use the notation for an inclusio as A-B-A where A is the pattern which is at the beginning and end of the section; B is the content enveloped by the inclusio. Other Patterns may be indicated within the inclusio such as: A-BCD-BCD-A or A-BC-D-CB-A.