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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 .
This is not a rule, though, and than would not be the first word in English to have multiple uses. But the than in different than doesnât even need to have its own definition. The word primarily means in comparison to or in contrast with, and these senses are perfectly in keeping with the wordâs use in different than.