var foo = new int[]{1,1,4,5,6,2,3,3,1,7,2,4,2,3};
foo
    .Aggregate(new List<List<int>>(), (seed, next) => {
        var listToAddTo = seed.FirstOrDefault(l=> !l.Contains(next));
        if (listToAddTo == null)
        {
            seed.Add(new List<int>(){ next });
        }
        else {
            listToAddTo.Add(next);
        }

        return seed;
    })
    .Select(x => x.OrderBy(y => y))
    .SelectMany(x => x);