How often in a view have you coded a selection formula to select all documents by form where the form name is not equal to A or B ? You'd normally write this as :
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SELECT Form<>"Form A" & Form<>"Form B"
Did you know there is a shorter way of writing this ? I discovered this by accident. Instead of the above use this :
SELECT !Form="Form A":"Form B"
This type of comparison will work anywhere, it's not limited to view selection formulas.