Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A proposal for a Chinese keyboard for cellphones, smartphones, ipads and
  tablets   In this paper, we investigate the possibility to use two tilings of the
hyperbolic plane as basic frame for devising a way to input texts in Chinese
characters into messages of cellphones, smartphones, ipads and tablets.

34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys