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https://yamcode.com/the-ugly-f....acts-about-mattresse
Mattresses Double Double beds (also known as full mattresses) were the only mattress sizes available prior to the time queen and king mattresses became popular in the 1950s. These beds are ideal for small rooms that require a cozy sleeping space without taking up a lot of floor space. They are also a good choice for teenagers as well as single adults and are easy to find online. Comfort A comfort