The proper way of dealing with issues is not starting with the tools. You start with the issue itself, and then select the tool most suited for the task.
So what for would you use this list of 10000 items?
There’s a nice introduction to the subject here https://support.sas.com/resources/papers/proceedings15/3024-2015.pdf
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Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.
Ready to level-up your skills? Choose your own adventure.