تئوری صف

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https://lh3.googleusercontent.com/-QEhq8Rkx2Co/UHbjTZNn4MI/AAAAAAAARtY/8cZGud7X68c/w497-h373/65a0614ctw1dxp0ht6k1kg.gif (https://plus.google.com/photos/105575532740889995171/albums/5798071486645017617/5798071492611137730)