ROPPONGI, Japan -- Students register for the 29th Kanto Area Department of Defense Dependent Students soroban contest May 25, 2011 at the New Sanno hotel, Roppongi, Japan. DoDDS students, including those from Yokota elementary and middle schools, showcased their math skills with a Japanese version of an abacus, called the soroban. (U.S. Air Force photo/Senior Airman Andrea Salazar)
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