Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards a theory of word order. Comment on "Dependency distance: a new
  perspective on syntactic patterns in natural language" by Haitao Liu et al   Comment on "Dependency distance: a new perspective on syntactic patterns in
natural language" by Haitao Liu et al

18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph