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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 .
Use been after the verb to have. Use being after the verb to be. Some writers occasionally confuse the words being and been. As a rule, the word been is always used after have (in any form, e.g., has, had, will have).