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Brockhaus-1911: Cogito, ergo sum
Eisler-1904: Cogito ergo sum · Cogito, ergo sum
Herder-1854: Cogito ergo sum
Kirchner-Michaelis-1907: cogito, ergo sum
Mauthner-1923: Cogito ergo sum
Meyers-1905: Cogĭto, ergo sum
Pierer-1857: Cogito, ergo sum