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  _____      ___     _____     _    _   __    __  
 /  ___||   / _ \\  |  __ \\  | || | || \ \\ / // 
| // __    | / \ || | |  \ || | || | ||  \ \/ //  
| \\_\ ||  | \_/ || | |__/ || | \\_/ ||   \  //   
 \____//    \___//  |_____//   \____//     \//    
  `---`     `---`    -----`     `---`       `

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