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    <p>That taks turned to be awesome on so many levels. I present you a pure LINQ (but not very efficient) solution.</p> <pre><code> static class Program { static void Main(string[] args) { var res = "cat".Anagrams(); foreach (var anagram in res) Console.WriteLine(anagram.MergeToStr()); } static IEnumerable&lt;IEnumerable&lt;T&gt;&gt; Anagrams&lt;T&gt;(this IEnumerable&lt;T&gt; collection) where T: IComparable&lt;T&gt; { var total = collection.Count(); // provided str "cat" get all subsets c, a, ca, at, etc (really nonefficient) var subsets = collection.Permutations() .SelectMany(c =&gt; Enumerable.Range(1, total).Select(i =&gt; c.Take(i))) .Distinct(new CollectionComparer&lt;T&gt;()); return subsets; } public static IEnumerable&lt;IEnumerable&lt;T&gt;&gt; Permutations&lt;T&gt;(this IEnumerable&lt;T&gt; collection) { return collection.Count() &gt; 1 ? from ch in collection let set = new[] { ch } from permutation in collection.Except(set).Permutations() select set.Union(permutation) : new[] { collection }; } public static string MergeToStr(this IEnumerable&lt;char&gt; chars) { return new string(chars.ToArray()); } }// class // cause Distinct implementation is shit public class CollectionComparer&lt;T&gt; : IEqualityComparer&lt;IEnumerable&lt;T&gt;&gt; where T: IComparable&lt;T&gt; { Dictionary&lt;IEnumerable&lt;T&gt;, int&gt; dict = new Dictionary&lt;IEnumerable&lt;T&gt;, int&gt;(); public bool Equals(IEnumerable&lt;T&gt; x, IEnumerable&lt;T&gt; y) { if (x.Count() != y.Count()) return false; return x.Zip(y, (xi, yi) =&gt; xi.Equals(yi)).All(compareResult =&gt; compareResult); } public int GetHashCode(IEnumerable&lt;T&gt; obj) { var inDict = dict.Keys.FirstOrDefault(k =&gt; Equals(k, obj)); if (inDict != null) return dict[inDict]; else { int n = dict.Count; dict[obj] = n; return n; } } }// class </code></pre>
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