finding consecutive lines with specific different words/chars

Hi!

I'm looking for a way in gvim to find the following CONSECUTIVE lines: (I'm numbering the lines for convenience this is not part of the text)

1. this is line 1 and these are the trailing chars sdf
2. this is line 1 and these are the trailing chars fds
3. this is line 1 and these are the trailing chars
4. this is line 2 and these are the trailing chars
5. this is line 3 and these are the trailing chars asdf
6. this is line 3 and these are the trailing chars asdf
7. this is line 3 and these are the trailing chars fdaa
8. this is line 4 and these are the trailing chars

I want to find in gvim, all the rows that are different from the one above them only in the written "line number". in this example it's: 4, 5, 8

a search command is preffered over a vimscript.

thanks for any useful help.

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