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The idea of combining the advantages of function and logic programming has attracted many researchers. Their work ranges from the integration of existing languages over higher-order logic to equational logic languages, where logic programs are augmented with equational theories, Recently, it has been proposed to handle those equational theories by complete sets of transformations. These transformations are extensions of the rules introduced by Herbrand and later used by Martelli and Montanaridoi:10.1016/0304-3975(90)90063-n fatcat:vwuw5ae2hbfpzkfxkqexg7gdt4