Assertion: nerve agent's use | /r/HasProperty | jobar
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Source sentences:
text: The U.N. mission found the likely use of the nerve agent sarin in the case of Khan al-Assal (19 March 2013), Saraqib (29 April 2013), Ghouta (21 August 2013), Jobar (24 August 2013) and Ashrafiyat Sahnaya (25 August 2013).