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Old 07 àÁÉÒ¹ 2010, 18:40
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Old 07 àÁÉÒ¹ 2010, 19:33
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¡Ó˹´ àÍ¡À¾ÊÑÁ¾Ñ·¸ì à»ç¹à«µ¢Í§¨Ó¹Ç¹¨ÃÔ§ R(x) á·¹ x à»ç¹¨Ó¹Ç¹¨ÃÔ§ Q(x) á·¹ x à»ç¹¨Ó¹Ç¹µÃáÂÐ
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$\exists x \left[\ R(x) \bigwedge \sim Q(x)\right]$

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