Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classification of quaternary Hermitian self-dual codes of length 20   A classification of quaternary Hermitian self-dual codes of length 20 is
given. Using this classification, a classification of extremal quaternary
Hermitian self-dual codes of length 22 is also given.

17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph