You can also use while with each, I find it reads better though it is still nested loops: 
while ( my ($key1,$hash1) = each %{$hoh} ) {
    while ( my ($key2,$value) = each %{$hash1} ) {
        ### CODE ###
    }
}

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In reply to Re: Traversing through HoH by tangent
in thread Traversing through HoH by snape

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