Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 4-Regular Edge-Transitive Graphs of Girth 4   This paper presents a characterization of edge-transitive graphs which are
four regular and have girth four. This class consists of four infinite families
plus four exceptional graphs.

14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph