This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "NA/UN exceptions" – news · newspapers · books · scholar · JSTOR (November 2016) (Learn how and when to remove this template message) The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted.Find sources: "NA/UN exceptions" – news · newspapers · books · scholar · JSTOR (November 2016) (Learn how and when to remove this template message) This article may require cleanup to meet Wikipedia's quality standards. The specific problem is: cleanup is needed to comply with WP:MOS. Please help improve this article if you can. (November 2016) (Learn how and when to remove this template message) The article's lead section may need to be rewritten. Please help improve the lead and read the lead layout guide. (November 2016) (Learn how and when to remove this template message) (Learn how and when to remove this template message)