What happened a few times while researching data mining research?

I’m trying to think of an idiomatic way to describe the phenomenon observed in my experiments as I have to prepare a disciplinary report. How does a Chinese idiom or expression get used? I quickly started to think about just in case you can read it) very quickly and naturally came to my mind, and I looked the English translations. I read a Wikipedia doc with the exact details.

I’ve found the following translation (apparently not idiomatic at all):

It happens that there is a similar case, it is not unique, but has its counterpart.

How can we become friends?