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

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發送短信 : Preservation of integrity constraints in definite DATALOG programs