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Alan, I am vouching for Zingel.
As proof, the creation date of the save file can be used – if he sends the save file on Monday, you can check the creation date and confirm that he indeed finished the playthrough on time.
Indeed, no one is immune to a floppy disk failure; I had such an incident once... However, I will tell you about this case at the online meeting if you invite me sometime.

Орден Феникса – харизматический :) лидер