var list = new List<string>
{
"1","2","3","4","5","3"
};
var datas = list.GroupBy(g => g).Where(w => w.Count() > 1).Select(s => s.Key).ToList();

var list = new List<string>
{
"1","2","3","4","5","3"
};
var datas = list.GroupBy(g => g).Where(w => w.Count() > 1).Select(s => s.Key).ToList();

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