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If it works for an ATM, it'll work for your home.
Here's a thing about numbers: they're really just letters in disguise. Take the number 6 for example. Maybe you think of one-third of the devil, or maybe you think of The Prisoner, or maybe you think of that pony ride your child went on during their sixth birthday party. Now that number isn't some abstract concept. It's a word in your head. And now you won't ever forget it. Unlike, say, a key in your other pants.