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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
perhaps because of the frequent coupling of the two terms in the news media. This is now the more common pronunciation for the adjective in American English, though not in British English, which retains the historical pronunciation. For the noun senses, less likely to appear in the news or to be contrasted with overt and its.