魔力规划：+~b~b+~bb~bb+~bbb~bbb+~a~a+~aa~aa+~aaa~aaa+ ~s~s+~ss~ss+~sss~sss+~ex~∞ 其他属xing规划：<+~b~b+~a~a+~s~s+~ex~exs~exs+~∞;