using System;

using System.Collections;

using System.Collections.Generic;

using static System.Math;

​

string[] lines = {

    "...", 

    "...", 

    "..x"};

​

int folds = 3;

​

​

folds *= folds;

​

for(int y = 0; y < lines.Length * folds; y++)

{

    int yIntermediate = y % (lines.Length * 2) - lines.Length;

    if(yIntermediate < 0) yIntermediate++;

    int yIndex = Abs(yIntermediate);

    for(int x = 0; x < 3 * folds; x++)

    {

        int xIntermediate = x % (lines.Length * 2) - lines.Length;

        if(xIntermediate < 0) xIntermediate++;

        int xIndex = Abs(xIntermediate);

        Console.Write(lines[yIndex][xIndex]);

    }

    Console.WriteLine();

}