| http://www.w3.org/ns/prov#value | - The apparatus in claim 9 wherein the user profile comprises either a set of user n-tuples or a first set of pointers to storage locations in the memory at which user entries are stored, wherein each of the user n-tuples comprises a separate rating value, supplied by a particular one of the users, for each corresponding one of a plurality of items, said items including the item non-rated by the use
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