شكرا لمرورك الجميل دكتورتنا
بس كلو الا الجامعة ما عرفنا كيف سجلناكي هههههههههههههههه 
If you have an apple...and I have an apple .and we exchange these apples ...then you and I will still each have one apple.,, But if you have an idea. and I have an idea.. and we exchange these ideas,,,, then each of us will have two ideas
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