Delete near duplicate rows

[T C]

I couldn’t find anything on this, which is why I’m asking here.

How do I delete near duplicate rows? Like the following:

https://www.fanfiction.net/s/11326921/1/The-Other-Shoe
https://www.fanfiction.net/s/11326921/3/The-Other-Shoe

Can I remove the lines not containing *\1* which is the main link for all the stories.

Thanks