Prepared but unimplemented Combinations method.

AioNet.Linq/ExtendedLinq.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+
+namespace AioNet.Linq
+{
+    public static class ExtendedLinq
+    {
+        public static IEnumerable<IEnumerable<T>> Combinations<T>(
+            this IEnumerable<T> source,
+            int subsequenceLength
+        )
+        {
+            throw new NotImplementedException();
+        }
+    }
+}