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8UNIT
7HFKQRORJ\ $UW
6FLHQFH (QJLQHHULQJ 0DWKHPDWLFV
더하기
2 더하1 기1
4 빼0기 0
3 2 빼기0 0
0
0
6FLHQFH 7HFKQRORJ\ (QJLQHHULQJ $UW 0DWKPDWLFV