public static function getFirstValues(array $slugs, array $attributeAvIds, $locale = 'en_US')
    {
        $results = self::getValues($slugs, $attributeAvIds, $locale);

        $return = array();

        foreach ($slugs as $slug) {
            if (!isset($return[$slug])) {
                $return[$slug] = null;
            }

            foreach ($results[$slug] as $value) {
                if ($return[$slug] === null) {
                    $return[$slug] = $value;
                    continue;
                }
                break;
            }
        }

        return $return;
    }