Hello August,

On Saturday June 12 2021 09:12, you wrote to me:

 AA> In addition, the "as long as it is unique" implies that it is not to
 AA> be an empty field.

False logic. The empty field is no more or no less unique than the field containing only the letter "a" or the field containg the string "XyZZy". Or anything else. The "unique" requirement just limits it to only use it once.

Cheers, Michiel

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