Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Primary Exploration to Quasi-Two-Dimensional Rare-Earth Ferromagnetic
  Particles: Holmium-Doped MoS2 Sheet as Room-Temperature Magnetic
  Semiconductor
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci