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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 .
That song, âCome Together,â is a classic first performed by The Beatles in the late 60s and it was used to great effect to illustrate the team joining forces in the first official trailer. Also read: 85 New Images From The Latest âJustice Leagueâ Trailer.