The value of the remaining letters written in the a | a format. If there are no letters left, the value is empty; otherwise, you call the template recursively.
用a | a格式写的剩余字母的值如果已没有字母，则该值为空；否则，递归调用该模板。
2
Now you calculate the value of all the remaining letters, each of them converted to the (a | a) format.
现在计算所有剩余字母的值，这些字母都转换成(a | a)格式。
3
Existing boundaries may need to be blurred, and ways to share the value of the remaining water identified.