How to beat 3N 1 2 3 1

Hi,

I'm up against some wierd formation here:

-----------ST-----------
---AML---AMC---AMR----
-------MC----MC--------
----------DMC-----------
-----DC---DC---DC------
------ ----GK------------

Anyone has encountered this one before and what does seems to be his weak points?

4-5-1 v style, passing down the flanks, red arrows on AML and AMR