Crossword Genius

Prefix with "logical" or "system" (3)

Ross

I believe the answer is:

eco

(Other definitions for eco that I've seen before include "Umberto - - , novelist" , "Green prefix" , "Umberto --, Italian writer" , "Environmental group" , "Umberto -, Italian author (The Name of the Rose)" .)

I've seen this clue in the Universal.
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