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use strict;
use warnings;
...

$,="\n";
print @folder;

E:\test\foldersize\1-folder\Allworth\Copy of VTT
E:\test\foldersize\1-folder\Allworth\VTT
...
E:\test\foldersize\5-folder\Brepols
E:\test\foldersize\5-folder\Else_UK\KAST2
E:\test\foldersize\5-folder\Else_UK

E:\test\foldersize\1-folder\Allworth\Copy of VTT
E:\test\foldersize\1-folder\Allworth\VTT
...
E:\test\foldersize\5-folder\Allworth\VTT
E:\test\foldersize\5-folder\Brepols\ARA
E:\test\foldersize\5-folder\Else_UK\KAST2