Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Merged Four Dirac Points at the Critical Interlayer Distance in
  Commensurately Twisted Bilayer Graphene: the Origin of the Zero Velocity
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci