Elephant ... Luck?

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This afternoon I was at the mall, I needed to buy a present for a friend who moves to her new house, the saleswoman told me to buy a set of three elephants that were lucky for her new home, the elephants were limestone Very pretty, I don't really know much about whether they are lucky or not, but I hope it brings a lot of prosperity to their new home. Do they believe in animals that give luck? Is it true that three elephants in a row next to the entrance of your house are lucky?