I confess that I took alot of information from Mr.Badrawy's notes
but I also I added alot of information to this notes so it's not his work completely.However Iadmired Mr.Ibrahim Badrawy more and it's not wrong to benifit from him . To my dear father (Mr.Khalled ) what's wrong with this work tell me please as soon as you can . thank you Mr.Mahmoud I always wait your reply
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The harder you work the more you gain
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