| http://www.w3.org/ns/prov#value | - ility of said second program; said third programs of said third program level (III) including a sequence control which forms an answer based on a pregiven question with the aid of said second program of said second program level (II); and, said one control unit including means for receiving the question of the other one of said control units and to output the answer to said other one of said contr
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