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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 .
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). The word being is never used after have. Being is used after to be (in any form, e.g., is, was, were). Examples: The word being can also be a noun.