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Brockhaus-1911: Et in Arcadia ego · Quos ego! · Et ego in Arcadia · Alter ego · Ego
Herder-1854: Quos ego · Alter ego
Kirchner-Michaelis-1907: alter ego
Meyers-1905: Et in Arcadia ego · Quŏs ego · Alter ego · Ego
Pierer-1857: Quos ego · Alter ego