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Console.WriteLine(string.Join("\n", s.GroupBy(c => c).Select(g => g.Key + ":" + g.Count())));
var result ="1233212231".GroupBy(a => a).Select(a => new {
key=a.Key.ToString(),
count=a.Count()
});
/*
+ [0] { key = "1", count = 3 } <Anonymous Type>
+ [1] { key = "2", count = 4 } <Anonymous Type>
+ [2] { key = "3", count = 3 } <Anonymous Type>
*/