ABSTRACT
The way that many programs work can be viewed as follows: https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203761731/b3f12f26-b2ff-4fb6-b76d-26d2fe2780b6/content/fig9_62_01_B.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
