I guess Bing is not perfect. I have 2021 installed on a laptop, and I checked it before I posted. Unless there was an update I missed or something. I just upgraded to 2024, and it is in there. But even there, some of the functions aren't exactly the same. I have BYROW, but only if I use a LAMBDA, the eta structure is not available.That's weird. Because when I looked it up in Bing
=IFERROR(SMALL(IFERROR(ROW($A$1:$A$10)/(COUNTIF($A$1:$A$10,ROW($A$1:$A$10))=0),""),ROW($A$1:$A$10)),"")
Works great!! Thank you so much!An non-volatile option
Excel Formula:=LET(s,SEQUENCE(10),FILTER(s,ISNA(XMATCH(s,A2:A10))))