Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong Twins of Ordinary Star-Like Self-Contained Graphs   A self-contained graph is an infinite graph which is isomorphic to one of its
proper induced subgraphs. In this paper, ordinary star-like self-contained
graphs are introduced and it is shown that every ordinary star-like
self-contained graph has infinitely many strong twins or none.

15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex