Duplicated tags

I recently discovered that some of my mp3s have duplicated tags, for example they have a double entry for "year".
I would to clean all redundant entries but the problem is how to find which ones of my about 4000 songs have duplicated tags. Is there any way to find them with mp3tag?
Thank you

Try the filter
"$meta_Sep(year,\\)" HAS \

Definitively, it seems to work! :huh:
And definitively, it was not within my range :rolleyes:
Thank you, Dano