public static void Main()
int[] xs = new int[] {1, 2, 3, 4};
for (int k = 0; k < xs.Length; k++) {
List<int> ys = new List<int> {1, 2, 3, 4};
foreach (int num in ys) {
Console.WriteLine("Oh God. What's Wrong?");
Console.WriteLine("All is well with the world.");