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List<int> list = new List<int>() { 1, 1, 2, 3, 4, 4, 4, 5, 6, 6, 7, 7, 7, 7, 7, 8, 8, 9 };
var max = (from l in list group l by l into coll select coll.Count()).Max();
int[] arr = new int[18] { 1, 1, 2, 3, 4, 4, 4, 5, 6, 6, 7, 7, 7, 7, 7, 8, 8, 9,};
var i = arr.GroupBy(a => a).Max(b => b.Count());