public static function getClasses($version)
    {
        if (false === in_array($version, self::getVersions())) {
            throw new \LogicException(sprintf("Version is not supported. Available: %s", implode(", ", self::getVersions())));
        }

        $version = explode(".", $version);
        $subVersion = $version[1];

        $icons = array();

        /**
         * 4.4.0 Icons
         */
        if (4 <= $subVersion) {
            $icons = FontAwesome\Version440::getIconsAll();
        }

        return $icons;
    }