Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Spreading of infections on random graphs: A percolation-type model for
  COVID-19
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
16
The categories of this paper are: stat
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an