@Override
	public String toString(){
		
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < GRID_SIZE; i++ )
		{
			for ( int j = 0; j < GRID_SIZE; j++)
			{
				sb.append("[ ");
				sb.append( StringUtils.rightPad(getLetterAt(i, j), 3) );
				sb.append("]");
			}
			sb.append(NEWLINE);
		}
		return sb.toString();
	}