Getting the Keys right for 2nd level grouping

Hi everybody ...
   I didnt really verify if this was  discussed earlier coz i am in a hurry .But  I am half way through solving a problem and some small 
   hint will do .
   Here is my XSL with first level grouping extracting distinct regions   and i am having problems grouping users with Region Nodeset.
  Any help appreciated .
  Following is  XSL (presently pulling distinct regions ) .. an Examle XML and  expected result .
Note : I applied Keys to do 2nd level for users  but i was able to pull out only 1 row in each region where as 
          there are many userid's as shown below.

 _______________My  XSL _____________________

<xsl:key name="distinct-region" match="*" use="@reg"/>


<xsl:template match="/">

   <xsl:for-each select="rep/uwr/los[@reg][generate-id()=generate-id(key('distinct-region', @reg))]">

	<xsl:value-of select="@reg"/>
    </xsl:for-each>
 </xsl:template>


_________________XML______________________________

<rep>
  <uwr>
	<los userid="1014" reg="Region 4">
		<review type="N"><![CDATA[11]]></review>
		<review type="Y"><![CDATA[16]]></review>
	</los>
	<los userid="1017" reg="Region 4">
		<review type="N"><![CDATA[7]]></review>
		<review type="Y"><![CDATA[17]]></review>
	</los>
	<los userid="1025" reg="Region 2">
		<review type="N"><![CDATA[13]]></review>
		<review type="Y"><![CDATA[12]]></review>
	</los>
  </uwr>
  <arr>
	<los userid="1014" reg="Region 4">
		<review type="N"><![CDATA[15]]></review>
		<review type="Y"><![CDATA[19]]></review>
	</los>
	<los userid="1017" reg="Region 4">
		<review type="N"><![CDATA[20]]></review>
		<review type="Y"><![CDATA[22]]></review>
	</los>
	<los userid="1025" reg="Region 2">
		<review type="N"><![CDATA[23]]></review>
		<review type="Y"><![CDATA[25]]></review>
	</los>
  </arr>
</rep>

____________Expected Result__________________________

Region 4
    Userid  UWR(N)  UWR(Y)   ARR(N)     ARR(Y)
    1014          11       16               15          19
    1017           7        17              20           22
    
Region 2
   Userid    UWR(N)  UWR(Y)   ARR(N)   ARR(Y)
    1025       13             12             23          25


Thanks  
- Kumar
    



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