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duff
<p>How do you know that <c>@data_file</c> keeps values from previous use? <c>@data_file</c> is lexical to the <c>CleanFiles()</c> subroutine. Each time you call <c>CleanFiles()</c> you're going to get a fresh <c>@data_file</c> (that's how <c>my</c> works). Are you <em>sure</em> about what you're seeing?
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