Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hadron 2001 Conference Summary: Theory   This contribution reviews some of the theoretical issues and predictions that
were discussed at HADRON2001. The topics are divided into principle areas, 1)
exotics, 2) vectors, 3) scalars, and 4) higher-mass states. The current status
of theoretical predictions for each area are summarized, together with a brief
description of experiment. New and detailed experimental results are presented
in the companion Experimental Summary by Klempt.

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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg