@Mic My this means was "unused" = "unused at any time In this particular workbook", I think this is well as very clear as making use of "unassigned" which I'd interpret precisely the same... but I get your stage. Pandas is a robust and flexible library that permits you to https://claytonkdwpg.anchor-blog.com/9203437/the-fact-about-code-shbet-that-no-one-is-suggesting