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In Petz 1 the Supply Case took the form of the Supply Shelf (since the distinction between a portable Supply Case and a Toy Closet room was not been made in Petz 1), and it also kept the name into Petz 2. The term Supply Case was finally coined for Petz 3 and 4. In Petz 5 the Toy Closet was built into the Supply Case to create a Carrying Case.