title: Query a List of List of Items in LINQ c#
body: <p>I am a bit new to LINQ, here is my problem. </p>
  
  <ul>
  <li>I have a List of List of Items</li>
  <li>I like to get the Items which are present in
  only one List (and if I could get the
  List in which they are without
  re-iterating through the "list of
  list" that would be great).</li>
  </ul>
  
  <p>I am trying without success to use the Aggregate / Except / Group keywords in the Linq query but nothing close to a solution so far.</p>
  
  <p>[EDIT]
  Could be for instance <code>List&lt;List&lt;int&gt;&gt;</code> and the condition that the value of the int is is not in the others lists.</p>
  
  <p>To be honest if I tried with several <code>foreach</code> I succeed to find the value items but as I am trying to learn LINQ I would like to know what kind of query I should write to get the results</p>
  
  <p>for instance</p>
  
  <pre><code> 1,2,6
   1,6
   3,5
   5,10
   3,10,6
  </code></pre>
  
  <p>will return 2 and the first list</p>