Add more details

To Ziming,

Can you add some explanations between lines?

Also, it would be great if you move the part for the alternate solution to the second solution.

Thanks!

To Ziming,

The solution 2 still doesn't have enough details. Please explain between lines (1. describe steps, 2 explain what E is, what kind of method you are using, and so on. )

Thanks, Hyunju