// Kahemõõtmelise massiivi kasutamine
class TwoDArray {
  public static void main(String args[]){
	int twoD[][] = new int[4][5];
	int i, j, k = 0;
	
	for (i = 0; i < 4; i++)
	  for (j = 0; j < 5; j++) {
		twoD[i][j] = k;
		k++;
		} 

	 for (i = 0; i < 4; i++){
           for (j = 0; j < 5; j++) 
		System.out.print(twoD[i][j] + " ");
		System.out.println();  //  reavahetus
		}
	}
}