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[Çü¿ë»ç] perpendicular
µî±Þ : SAT
´Ü¾î : perpendicular

¶æ : ¼öÁ÷ÀÇ, ¿¬Á÷ÀÇ, Á÷¸³ÇÑ

¶æ(¿µ¾î) : Straight up and down