μπλοκ αλυσίδα, δεδομένα, αρχεία, έννοια, Σύστημα, ομοφωνία, μηχανισμός, συναλλαγή, διαχείριση, ΟΙΚΟΔΟΜΙΚΟ ΤΕΤΡΑΓΩΝΟ, μπλοκ δεδομένων
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