human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "reward testing equivalences for processes"):
  Abstract: May and must testing were introduced by De Nicola and Hennessy to define semantic equivalences on processes. May-testing equivalence exactly captures safety properties, and must-testing equivalence liveness properties. This paper proposes reward testing and shows that the resulting semantic equivalence also captures conditional liveness properties. It is strictly finer than both the may- and must-testing equivalence.

Includes members:
  Member "lean and full congruence formats for recursion":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "failure trace semantics for a process algebra with time outs preliminary report")
  Member "ensuring liveness properties of distributed systems a research agenda":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "justness a completeness criterion for capturing liveness properties")
  Member "progress fairness and justness in process algebra":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "ensuring liveness properties of distributed systems open problems")
  Member "on the axiomatizability of impossible futures":
    also connected through other hyperedges:
      (none)
  Member "the coarsest precongruences respecting safety and liveness properties":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "failure trace semantics for a process algebra with time outs preliminary report")
  Member "characterising testing preorders for finite probabilistic processes":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "ensuring liveness properties of distributed systems open problems")

Question: Please tell me which class the source paper belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.LO(Logic in Computer Science)