using System;

internal static class Program
{
    private static void Main(string[] args)
    {
        int[,] grid = { { 2, 3 }, { 4, 5 } };
        int[][] groups = { new[] { 1, 2 }, new[] { 3 } };
        Console.WriteLine($"Grid corner: {grid[1, 1]}");
        Console.WriteLine($"Rows: {grid.GetLength(0)}; second group: {groups[1].Length}");
    }
}