Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent OPAL measurements in non-perturbative QCD   Using multihadronic Z0 decays recorded in 1991-1995 by the OPAL detector in
e+e- collisions at LEP1, experimental analyses were made of the following
subjects: (a) Bose-Einstein correlations; (b) Intermittency and correlations;
(c) rho and omega spin alignments; (d) A search for the tensor glueball
candidate fj(2200).

3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg