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: "proof pattern recognition and lemma discovery in acl2"
  Abstract: We present a novel technique for combining statistical machine learning for proof-pattern recognition with symbolic methods for lemma discovery. The resulting tool, ACL2(ml), gathers proof statistics and uses statistical pattern-recognition to pre-processes data from libraries, and then suggests auxiliary lemmas in new proofs by analogy with already seen examples. This paper presents the implementation of ACL2(ml) alongside theoretical descriptions of the proof-pattern recognition and lemma discovery methods involved in it.

Connected through hyperedge HE-1 (induced by source paper "lifter language to encode induction heuristics for isabelle hol"):
  with members:
    - "pamper proof method recommendation system for isabelle hol"
    - "goal oriented conjecturing for isabelle hol"
    - "proof mining with dependent types"
    - "tactictoe learning to reason with hol4 tactics"
    - "a proof strategy language and proof script generation for isabelle hol"
    - "isabelle jedit a prover ide within the pide framework"

Connected through hyperedge HE-2 (induced by source paper "proof mining with dependent types"):
  with members:
    - "goal translation for a hammer for coq extended abstract"
    - "sepia search for proofs using inferred automata"
    - "learning assisted theorem proving with millions of lemmas"
    - "hipster integrating theory exploration in a proof assistant"
    - "mining state based models from proof corpora"
    - "recycling proof patterns in coq case studies"
    - "lemma mining over hol light"
    - "machine learning in proof general interfacing interfaces"

Connected through hyperedge HE-3 (induced by source paper "program synthesis from polymorphic refinement types"):
  with members:
    - "bounded refinement types"
    - "type assisted synthesis of recursive transformers on algebraic data types"

Connected through hyperedge HE-4 (induced by source paper "mining state based models from proof corpora"):
  with members:
    - "mizar 40 for mizar 40"
    - "premise selection for mathematics by corpus analysis and kernel methods"
    - "ml4pg in computer algebra verification"
    - "a graphical language for proof strategies"
    - "machine learning in proof general interfacing interfaces"
    - "learning assisted automated reasoning with flyspeck"

Connected through hyperedge HE-5 (induced by source paper "hott formalisation in coq dependency graphs ml4pg"):
  with members:
    - "recycling proof patterns in coq case studies"
    - "machine learning in proof general interfacing interfaces"
    - "dependencies in formal mathematics applications and extraction for coq and mizar"
    - "dependencies in formal mathematics applications and extraction for coq and mizar"
    - "type classes for mathematics in type theory"

Connected through hyperedge HE-6 (induced by source paper "proof pattern search in coq ssreflect"):
  with members:
    - "ml4pg in computer algebra verification"
    - "recycling proof patterns in coq case studies"
    - "lemma mining over hol light"

Connected through hyperedge HE-7 (induced by source paper "acl2 ml machine learning for acl2"):
  with members:
    - "integrating testing and interactive theorem proving"

Connected through hyperedge HE-8 (induced by source paper "recycling proof patterns in coq case studies"):
  with members:
    - "ml4pg in computer algebra verification"
    - "statistical proof pattern recognition automated or interactive"
    - "a qualitative comparison of the suitability of four theorem provers for basic auction theory"
    - "decidable classes of tree automata mixing local and global constraints modulo flat theories"
    - "machine learning in proof general interfacing interfaces"
    - "computing persistent homology within coq ssreflect"
    - "learning assisted automated reasoning with flyspeck"
    - "type classes for efficient exact real arithmetic in coq"

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)