A

Authors 3

  1. Heinz-Dieter Ebbinghaus corresponding

    University of Freiburg

    Affiliation as printed

    Mathematical Institute, University of Freiburg, Freiburg, Germany

  2. University of Freiburg

    Affiliation as printed

    Mathematical Institute, University of Freiburg, Freiburg, Germany

  3. RWTH Aachen University

    Affiliation as printed

    Department of Computer Science, RWTH Aachen University, Aachen, Germany

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