| http://www.w3.org/ns/prov#value | - uding the steps of: (a) generating a control signal in accordance with first to N-th communication areas in each of which said responders and said interrogator can make communication with each other, wherein N is a positive integer equal to or greater than two; (b) binary-searching said number space in each of said first to N-th communication areas one by one to identify a responder(s) existing th
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