أرسل هذا في رسالة قصيرة: Arboricity : an acyclic hypergraph decomposition problem motivated by database theory

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| |  \ ||   \ ` //   |    \\  | || | || |  --  // 
| |__/ ||    | ||    | [] ||  | \\_/ || |  --  \\ 
|_____//     |_||    |  __//   \____//  |______// 
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