...for non-executable programs. See https://sourceacademy.org/sicpjs/4.1.4 Example: <img width="836" alt="Screen Shot 2022-02-28 at 3 38 09 PM" src="https://user-images.githubusercontent.com/30220768/156055345-45d11899-8806-4200-9e90-a6a437ef0dc4.png">
