Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A model of composite structure of quarks and leptons   In the model every quark or lepton is identified with a quartet of four "more
elementary" particles. One particle in a quartet is a massive spin-0 boson and
other three particles are massless spin-1/2 fermions.

36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con