Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twisted Sector Yukawa Couplings For The ${\bf Z}_M\times {\bf Z}_N$
  Orbifolds   The moduli dependent Yukawa couplings between twisted sectors of ${\bf
Z}_M\times {\bf Z}_N$ Coxeter orbifolds are studied.

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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ