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They're so simple. Anyone who can read should be able to navigate the simple process with ease. Our local Home Depot has 4 such automatic checkers, and the only time I've seen an issue with one was an elderly gentleman who was promptly helped along (by me) and the line continued without interruption. It's been a boon to business for them, and while it's not as attractive as an 18 year old blond working a summer job, it's easily 10 times as efficient.
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