Consider a data set that contains the variables x1-x500 in a space-delimited file Pr3x1x500.txt. Please begin by reading this data set into the SAS data set x1x50, with var names x1-x500, but only keep x1-x50 and only keep the first 10 records of the 100 in the original data set. This SAS data set will be used for testing purposes. The problem is that you have been told that these 50 variables are actually in groups of 5, and should have been labeled with the prefixes a,b,c,d,e …
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