[fw-general] router question - how to hide default module, controller and action in url?

[zfuser]

I created router
$router = $frontController->getRouter();
$router->addRoute(
    'url',
    new
Zend_Controller_Router_Route(':lang/:module/:category/:controller/:action/:test',
 
    array('module'=>'default', 'controller' => 'index', 'action' => 'index',
'lang' => 'en', 'category'=> 'categ1'))
);

when url is [url]http://domain/en/default/pc/index/index/something/[/url]
everything works fine. $this->getRequest(); output in Controller is
["_params:protected"] => array(6) {
    ["lang"] => string(2) "en"
    ["module"] => string(7) "default"
    ["category"] => string(2) "pc"
    ["controller"] => string(5) "index"
    ["action"] => string(5) "index"
    ["test"] => string(9) "something"
  }

Problem occurs when I change url, for example remove default index
controller  and action [url]http://domain/en/default/pc/something/[/url]

error is:
Fatal error: Uncaught exception 'Zend_Controller_Dispatcher_Exception' with
message 'Invalid controller specified (en)' in
C:\wamp\www\ZendFramework-1.0.3\library\Zend\Controller\Dispatcher\Standard.php:198
...

What should I change in router definition if I want that results of these
urls:
[url]http://domain/en/default/pc/index/index/something/[/url]
[url]http://domain/en/pc/index/index/something/[/url]
[url]http://domain/en/pc/index/something/[/url]
[url]http://domain/en/pc/something/[/url]
[url]http://domain/pc/something/[/url]

be the same?:
["_params:protected"] => array(6) {
    ["lang"] => string(2) "en"
    ["module"] => string(7) "default"
    ["category"] => string(2) "pc"
    ["controller"] => string(5) "index"
    ["action"] => string(5) "index"
    ["test"] => string(9) "something"
  }
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