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- var result =
- myList
- .SelectMany(x => x.InnerList)
- .Select(y => y.uniqueCustomerIdentifier)
- .GroupBy(id => id)
- .Where(g => g.Skip(1).Any())
- .Select(g => g.Key)
- .ToList()
- var results = from item in list
- group item by item.id into g
- select g.First();
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