2 pages in a A3 landscape paper

[Federico Bruni]

How can I tell LilyPond to print two pages in a A3 landscape paper?
In the attached example, I'd like to have 2 pages instead of 4.
Now it's:
1
2
3
4

I'd like it to be:
1  2
3  4

I could not find anything in the doc.. and the -user archive site is 
not reachable now.
I've tried with google, but this does not work:
site:http://lists.gnu.org/pipermail/lilypond-user/ a3

So I need your help, I'm in a hurry..
Thanks!

Federico
--
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a3-landscape.ly
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