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: "milestones for teaching the spreadsheet program"
  Abstract: There are different manners of teaching a spreadsheet program. In any case, it is intended that the teacher settles the objectives of the course and adapts them to the particular audience he/she has to deal with. This paper aims at providing any teacher whatever his/her specific objectives and his/her audience with elements to help him/her building a course. It focuses mainly on two important issues: 1 - select in all that may be said about such complex tools, what is prior to know and to teach, i.e. what leads to autonomy in using but also to autonomy in learning (because everything cannot be taught) and 2 - show how concepts are closely related to good formatting considerations. A method based on the "invariants of information processing" is outlined, partially illustrated and an implementation is described throughout a course designed for students preparing a master in Education Sciences.

Connected through hyperedge HE-1 (induced by source paper "defending the future an msc module in end user computing risk management"):
  with members:
    - "eusprig team work tools education audit management"
    - "reducing overconfidence in spreadsheet development"
    - "controlling end user computing applications a case study"
    - "when why and how to test spreadsheets"
    - "investigating the potential of test driven development for spreadsheet engineering"
    - "the importance and criticality of spreadsheets in the city of london"
    - "recommended practices for spreadsheet testing"
    - "spreadsheet engineering a research framework"

Connected through hyperedge HE-2 (induced by source paper "teaching spreadsheets curriculum design principles"):
  with members:
    - "from error detection to behaviour observation first results from screen capture analysis"
    - "an exploratory analysis of the impact of named ranges on the debugging performance of novice users"
    - "does an awareness of differing types of spreadsheet errors aid end users in identifying spreadsheets errors"
    - "new guidelines for spreadsheets"

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.HC(Human-Computer Interaction)