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# build hash
while() {
...
# key1 is a number
# key2 is a sequential number
}

$hshFoo{2823}{0} = 2823_0.xml
$hshFoo{2823}{1} = 2823_1.xml
$hshFoo{2823}{2} = 2823_2.xml
$hshFoo{2823}{3} = 2823_3.xml

    foreach $key1 (keys %hshFoo) {
        foreach $key2 (keys %{$hshFoo{$key1}}) {
...
2823/1 => 2823_1.xml
2823/2 => 2823_2.xml
2823/3 => 2823_3.xml