public int getMatrix_row_position(int position){
		 switch (position) {
	         case 1:  return 7;
	         case 2:  return 6;
	         case 3:  return 5;
	         case 4:  return 4;
	         case 5:  return 3;
	         case 6:  return 2;
	         case 7:  return 1;
	         case 8:  return 0;
		 }
		return (Integer) null;
	}