public function getUSAsciiClone()
    {
        $clone = clone $this;
        $clone->name = Strings::toAscii($clone->name);
        $clone->formula = Strings::toAscii($clone->formula);
        $clone->categories = [];
        foreach ($this->categories as $category) {
            $categoryClone = clone $category;
            $categoryClone->examples = Strings::toAscii($categoryClone->examples);
            $clone->categories[] = $categoryClone;
        }

        return $clone;
    }