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    if ($counter <= 8) {
        $sum_values[$x] += $ifSpeeds{ $key };
...
        $sum_values[$x] = $ifSpeeds{ $key };
        $counter = 1;
    }

    $sum_values[$x] += $ifSpeeds{ $key };
    $x++ unless ++$counter % 8;

    $sum_values[$counter++/8] += $ifSpeeds{ $key };     # the [] impli
+es int(...)