Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A symmetry test for quasilinear coupled systems   All quasilinear NLS-type systems with fourth order symmetry are listed.
Vector generalizations of some of them are constructed. Local master symmetries
for several systems from the list are found.

5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph