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[¸í»ç] permutation
µî±Þ : SAT
´Ü¾î : permutation

¶æ : ¼ø¿­. (¼ø¼­ÀÇ) º¯È¯, ġȯ

¶æ(¿µ¾î) : Reciprocal change, different ordering of same items