human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "on definite program answers and least herbrand models"
  Abstract: A sufficient and necessary condition is given under which least Herbrand models exactlycharacterize the answers of definite clause programs.

Connected through hyperedge HE-1 (induced by source paper "proving completeness of logic programs with the cut"):
  with members:
    - "correctness and completeness of logic programs"
    - "on completeness of logic programs"
    - "automated termination analysis for logic programs with cut"
    - "proving correctness and completeness of normal programs a declarative approach"
    - "the witness properties and the semantics of the prolog cut"

Connected through hyperedge HE-2 (induced by source paper "correctness and completeness of logic programs"):
  with members:
    - "on completeness of logic programs"
    - "truth versus information in logic programming"
    - "logic control on program construction and verification"
    - "logic control an example of program construction"
    - "xsb extending prolog with tabled logic programming"
    - "polytool polynomial interpretations as a basis for termination analysis of logic programs"
    - "automated termination proofs for logic programs by term rewriting"
    - "proving correctness and completeness of normal programs a declarative approach"

Connected through hyperedge HE-3 (induced by source paper "logic control on program construction and verification"):
  with members:
    - "proving completeness of logic programs with the cut"
    - "correctness and completeness of logic programs"
    - "on completeness of logic programs"
    - "sicstus prolog the first 25 years"
    - "polytool polynomial interpretations as a basis for termination analysis of logic programs"
    - "proving correctness and completeness of normal programs a declarative approach"
    - "classes of terminating logic programs"

Question: Please tell me which class the center node 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)