List> numbers = new List
>() { new List
{1, 2, 3}, new List {4, 5}, new List {6, 7, 8} }; List combinedNumbers = numbers.SelectMany(x => x).ToList(); // Output: 1, 2, 3, 4, 5, 6, 7, 8
ListThis method is part of the NUnit.Framework package library, which is a popular testing framework for C# applications.sentences = new List () { "The quick brown fox.", "Jumped over the lazy dog.", "The end." }; List words = sentences.SelectMany(s => s.Split(' ')).ToList(); // Output: The, quick, brown, fox., Jumped, over, the, lazy, dog., The, end.