@Override
	boolean isGoal() {
		if((board.length != GOAL.length) || (board[0].length != GOAL[0].length)) return false;
		for(int i = 0; i < board.length; i++){
			for(int j = 0; j < board[0].length; j++){
				if(board[i][j] != GOAL[i][j]) return false;
			}
		}
		return true;
	}