German 4-letter Diplomatic Code - "GLEA"

These are scans of a few pages of the reconstruction work sheets on a German Diplomatic code used during WWII, called "GLEA". I don't have very much information about this code other than what might be deduced from the scans. Since the code is ordered, I assume it was further encrypted in some way, or the security would have been close to none.

Scan of the first two columns of the dictionary

Scan of table showing code groups for dates

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