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| || | ||   / _ \\  | |  | ||  \ \\/ // |      \\ 
| || | ||  | / \ || | |/\| ||   \ ` //  |  --  // 
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 \____//    \___//  |_// \_||    |_||   |______// 
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Text this: On the algebraic structure of quasi-cyclic codes II: Chain rings