article_snippet.sent: May 15, May 16,  May 19 .
article_snippet.sent: August 14, August 15, August 17 .
article_snippet.sent: This is because in the months of May and June there are numbers (dates) that only occur once across the four months - namely May 19 and June 18.
article_snippet.sent: This leaves just three dates to chose from - July 16, Aug 15 and Aug 17.
article_snippet.sent: Given that there are two dates left in August and one in July, it has to be the July date.
article_snippet.sent: So the answer is July 16.
highlights_snippet.sent: Teaser generated furious online debate - but correct answer was July 16 .