private function parseSizeWord($word)
    {
        $sizeWord = strtoupper(preg_replace('/([a-z])([A-Z])/', '$1_$2', $word));
        if (array_key_exists($sizeWord, $this->sizes)) {
            $size = $this->sizes[$sizeWord];
        } else {
            $size = 0;
        }
        return $size;
    }