Match items in large list

[Fisherking]

Thank you all for your answers! I must say I'm really impressed by the
willing to help and the quick responses in this group (since it is my
first post)!

I solved the problem using SQL-queries. I added a id, the same for
each item in a chain (two or more similar posts) and just updated the
database for each unique post. I had to do this anyway and I think it
is the simplest and quickest way!

thanks again!