This SAS Function has two faces...
SAS Substr Function has two applications, the right side of and the left side of application. The right side refers to the fact that the substr function is to the right of the = or assignment operator, while in the left hand , the substr function is to the left of the assignment operator.
The right side application is all about taking what you want from a string and displaying only that. The left side application is about changing some parts of a string to something different.
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