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HEED 103 Summer Lecture Three .pptx

this is a presentation and in the 21 slide is question  followed by 4 cases slide 22, 23,24 ,25 each case should have tow point as what is explained in slide 21 and for the first point the answer in going  to be one of the themes in slide 3 and for the second point as you understand  form the presentation  

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