Collect items in multiselect cell from one cell if item was not used by second cell

I have a cell (multi-select type) with all possible items listed. I have another cell, that is also multi-select that uses some or all items from cell one. I need to collect all items from cell one that was not used in cell 2 in cell 3.


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I feel that It should be somehow Join and collect minus what was used. Please see picture. Any suggestions?

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