RepetitiveStructures

using System;
//Create a program to ask the user for two numbers and display the numbers between them (both included), three times: using "for", using "while" and using "do..while"

//Enter first number: 6
//Enter last number 12

//6 7 8 9 10 11 12
//6 7 8 9 10 11 12
//6 7 8 9 10 11 12
class RepetitiveStructures
{
    static void Main()
    {
        int firstNumber = int.Parse(Console.ReadLine());
        int secondNumber = int.Parse(Console.ReadLine());

        for (int column = 1; column <= 3; column++) // draws the columns
        {
            for (int line = firstNumber; line <=secondNumber; line++) //fills in the rows with numbers
            {
                Console.Write("{0} ", line);
            }
            Console.WriteLine(); // interval at the end of each line
        }
    }
}