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Excel's UNIQUE function can't skip columns—unless you use this trick
Nest CHOOSECOLS inside UNIQUE to extract non-adjacent columns, and use INDIRECT for interactive header dropdowns.
If you see the error “This value doesn’t match the data validation restrictions defined for this cell” when entering a value in an Excel cell, the solutions ...
If you use simple copy and paste methods to duplicate an Excel drop-down list, you may discover a problem; when you copy a cell that has a drop-down list and press "Ctrl-V" to paste it into a new cell ...
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