Hello, I am new SAS and still learning, I have a set of IDS and I need to add a leading character to only ones that do not start with other prefix. In other words, I have a data like this and I want it to be: 1 samplnew-1 2 samplnew-2 3 samplnew-3 4 samplnew-4 sampl-1 sampl-1 sampl-2 sampl-2 sampl-3 sampl-3 sampl-4 sampl-4 Thank you
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