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For strongly correlated oxides,it has been a longstanding issue regarding the role of the chemical ordering of the dopants on the physical properties.Using unit cell by unit cell superlattice growth technique,we determine the role of chemical ordering of the Pr dopant in a colossal magnetoresistant(La1-yPry)1-xCaxMnO3(LPCMO)system,which has been well known for its large length scale electronic phase separation phenomena.