Day i do not know

77. Combinations/Program.cs

@@ -0,0 +1,11 @@
+namespace _77._Combinations;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        var res = new Solution().Combine(4, 2);
+        foreach(var row in res)
+            Console.WriteLine(string.Join(" ", row));
+    }
+}