Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On enumeration of tree-rooted planar cubic maps. II   In the work [4] tree-rooted planar cubic maps with marked directed edge (not
in this tree) were enumerated. The number of such objects with $2n$ vertices is
$C_{2n}\cdot C_{n+1}$, where $C_k$ is Catalan number. In this work a marked
directed edge is not demanded, i.e. we enumerate tree-rooted planar cubic maps.
Formulas are more complex, of course, but not significantly.

4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th