Find the general rule

https://blog.acolyer.org/2018/01/29/the-paradigms-of-programming/ Robert Floyd:

After solving a challenging problem, I solve it again from scratch, retracing only the insight of the earlier solution. I repeat this until the solution is as clean and direct as I can hope for. Then I look for a general rule for attacking similar problems, that would have led me to approach the given problem in the most efficient way the first time. Often, such a rule is of permanent value.