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use strict;
use warnings;
...
  my $sIndent = ' ' x ($TAB_WIDTH*$iDepth);
  printf($FORMAT, "$sIndent$sLocal", $sPath);
}

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c                             /c/
   aa                         /c/aa/
...
   cc                         /c/cc/
   a1.mp3                     /c/a1.mp3
   a2.mp3                     /c/a2.mp3