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The phrase "one a penny, two a penny" means something that is very cheap or inexpensive. It is often used to describe items that are sold in bulk or in large quantities. The phrase is thought to have originated in the 17th century, when copper pennies were commonly used. At that time, it was possible to buy a single pennyworth of goods, such as a small candy or a trinket. The phrase "one a penny, two a penny" was used to describe these inexpensive items.
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