Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Orbifold Compactification with Three Families from Twisted Sectors   We obtain a three generational $SU(3)_c\times SU(3)_w \times U(1)^4\times
[SO(12)\times U(1)^2]^\prime$ model from an orbifold construction with the
requirement that three generations arise from twisted sectors. There exist
supersymmetric vacua realizing the standard model. In one example the anomalous
$U(1)$ breaks the gauge symmetry down to $SU(3)_c\times SU(2)_w\times
U(1)_Y\times SO(12)^\prime$.

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The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin