Query a List of List of Items in LINQ c#

Question

I am a bit new to LINQ, here is my problem.

• I have a List of List of Items
• 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).

I am trying without success to use the Aggregate / Except / Group keywords in the Linq query but nothing close to a solution so far.

[EDIT] Could be for instance List<List<int>> and the condition that the value of the int is is not in the others lists.

To be honest if I tried with several foreach 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

for instance

 1,2,6
 1,6
 3,5
 5,10
 3,10,6

will return 2 and the first list

Answer 1

var query = from list in lists
            from value in list
            where lists.Where(l => l.Contains(value)).Any()
            select new { List = list, Value = value };

Answer 2

This will get you the unique integers:

var ints = listOfLists.SelectMany(l => l);
var uniques = ints.Where(i => ints.Count(val => val == i) == 1);