Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Influence of the rare-earth element on the effects of the structural and
  magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess