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Whether you are in the schoolyard or the prison yard, the theory remains the same: If you’re the new guy and want to prove your toughness, go pick a fight with the biggest guy in the yard. That’s what Boston Celtics rookie Marcus Smart did in Wednesday’s home win over the Sacramento Kings. In the fourth quarter with the Celtics pulling away, the 6-4, 220-pound Smart ran directly into the chest of the 6-11, 270-pound DeMarcus Cousins, who was trying to set