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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 .
Alternating in English Versions of the Bible with grace, it is used chiefly of man, but sometimes also of God (Gen 18:3; 30:27; 39:21; Ex 3:21; 2 Sam 15:25, in the eyes of Yahweh, etc.).