c# count number of element occurrences in List

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List<string> myList = new List<string> { "A", "B", "B", "C", "C", "C" };

var occurrences = myList.GroupBy(x => x).ToDictionary(y => y.Key, z => z.Count());

// Output:
// [A, 1]
// [B, 2]
// [C, 3]