The datalines step is there to show test data that we can run on our machines. We do not have access to your computer, or data, so it has to be created by us, providing datastep with datalines provides a means for us to have some data to work with, which is essential considering SAS is a data based language: https://communities.sas.com/t5/SAS-Communities-Library/How-to-create-a-data-step-version-of-your-data-AKA-generate/ta-p/258712
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