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var s = "123 456 123 789 456 987 678 689";
var q = from x in s.Split(' ')
group x by x into g
select new { name = g.Key, cnt = g.Count() };
foreach (var x in q) Console.WriteLine(x);
var q = from x in s.Split(' ').ToArray()
group x by x[0] into g
select new { name = g.First(), cnt = g.Count() };
var s = "123 456 123 789 456 987 678 689";
var q = from x in s.Split(' ').ToArray()
group x by x[0] into g
select new { name = g.Min(p => p), cnt = g.Count()};
foreach (var x in q) Console.WriteLine(x);