Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple construction of cover-free $(s,\ell)$-code with certain
  constant weight   We give a method of constructing a cover-free $(s, \ell)$-code. For $k > s$,
our construction yields a $ {{n \choose s} \choose \ell}\times {n \choose k}$
cover-free $(s, \ell)$-code with a constant column weight.

20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con