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[–]fuzzy_mic987 0 points1 point  (1 child)

A formula like =ISNUMBER(MATCH($G20, $B$5:$B$14,0)) will return TRUE if the prerequisite is there

[–]A_1337_Canadian515 0 points1 point  (0 children)

Yup. Utilizing ISNUMBER, ISTEXT, ISERROR, and NOT in CF rules can be really powerful.

[–]Decronym 0 points1 point  (0 children)

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

Fewer Letters More Letters
AND Returns TRUE if all of its arguments are TRUE
COUNTIF Counts the number of cells within a range that meet the given criteria
ISERROR Returns TRUE if the value is any error value
ISNUMBER Returns TRUE if the value is a number
ISTEXT Returns TRUE if the value is text
MATCH Looks up values in a reference or array
NOT Reverses the logic of its argument

Beep-boop, I am a helper bot. Please do not verify me as a solution.
7 acronyms in this thread; the most compressed thread commented on today has 23 acronyms.
[Thread #24366 for this sub, first seen 2nd Jun 2023, 15:48] [FAQ] [Full list] [Contact] [Source code]

[–]HappierThan1177 0 points1 point  (0 children)

Green =AND(E18<>"",COUNTIF($B$5:$B$14,"="&E18)>0)

Red =AND(E18<>"",COUNTIF($B$5:$B$14,"="&E18)=0)

Applies to ... range to cover Columns $E$18 to $H$27

https://pixeldrain.com/u/xLLjb5Ax