Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Gray Code for cross-bifix-free sets   A cross-bifix-free set of words is a set in which no prefix of any length of
any word is the suffix of any other word in the set. A construction of
cross-bifix-free sets has recently been proposed by Chee {\it et al.} in 2013
within a constant factor of optimality. We propose a \emph{trace partitioned}
Gray code for these cross-bifix-free sets and a CAT algorithm generating it.

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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci