Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffractive structure functions from HERA   Recent results on diffraction at HERA are presented, focusing on the
measurement of the inclusive diffractive cross section and on the study of two
and three jets in diffractive ep scattering.

29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs