” المعلم يسأل بيلي بوب: “إذا كان لديك 12 خروفًا وقفز أحدهم من فوق السياج، فكم عدد الأغنام المتبقية؟” “يجيب بيلي بوب”: “لا شيء.” “يقول المعلم: “حسنًا”، “أنت بالتأكيد لا تعرف عملية الطرح.” “ربما لا”، -رد بيلي بوب،- “لكنني بالتأكيد أعرف خرافي.”

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