using System; // equivalent to import, but there's a bunch of stuff imported here

​

​

public class Program

{

    public static void Main()

    {

        int lowerNumber = 4;

        int higherNumber = 16;

        while (lowerNumber <= higherNumber) {   

            if (lowerNumber >= 1 && lowerNumber <= 10) {                

                Console.WriteLine(lowerNumber + ":" + (lowerNumber * lowerNumber));             

            }

            lowerNumber++;

        }

    }

}