| http://www.w3.org/ns/prov#value | - In describing the embodiments, same parts will be given the same names and reference symbols, and repetitive description of which will be omitted. [0049] To help understanding the present invention, functions of a refrigerator will be described. [0050] The refrigerator is an appliance configured to perform a cold storage function in which food or drink are stored and conserved in a fresh state, an
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