Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Tracer Diffusion in a Dislocated Lamellar System"   A Comment on the Letter by Victor Gurarie and Alexander E. Lobkovsky, Phys.
Rev. Lett. 88, 178301 (2002). The authors of the Letter offer a Reply.

7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an