Crossword Genius

"Cogito ___ sum"

Ross

I believe the answer is:

(Other definitions for ergo that I've seen before include "'Cogito, ---- sum'" , "Consequently" , "Therefore (Latin)" , "'Therefore, to the old Romans (4)'" , "so philosopher wrote in Latin" .)

I've seen this clue in The Washington Post and the L.A. Times Daily.
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