| http://www.w3.org/ns/prov#value | - length, wherein p is a natural number, to output as a secondary retrieval data; a second memory for storing m-pieces of second storage data with p-bit length in a manner to correspond to each word of the first storage data, the second storage data being derived by compressing the first storage data for word by word; the second memory comparing the secondary retrieval data with the second storage d
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