CakePHP Routing, using a language prefix with a default prefix

I'm trying to create a routing prefix that would be default.

http://localhost/heb/mycont would leave to the Hebrew page, while

http://localhost/mycont would lead to the English page.


This code allows me to use 0-3 letters for language, but it still requires a language!

http://localhost/a/mycont would work

http://localhost/mycont doesn't work

Any ideas how to fix that?
Is it even possible with the default routing?