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Count from 11 to 20,and count back from 20 to 11.
 ±Û¾´ÀÌ : ÃÖ°í°ü¸®ÀÚ
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11~20±îÁö ¼¼¾î º¸¼¼¿ä.±×¸®°í 20ºÎÅÍ 11±îÁö °Å²Ù·Îµµ ¼¼¾î º¸¼¼¿ä.