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__    __   _    _              _    _    _    _   
\ \\ / // | || | ||     ___   | || | || | |  | || 
 \ \/ //  | || | ||    /   || | || | || | |/\| || 
  \  //   | \\_/ ||   | [] || | \\_/ || |  /\  || 
   \//     \____//     \__ ||  \____//  |_// \_|| 
    `       `---`       -|_||   `---`   `-`   `-` 
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發送短信 : Preservation of integrity constraints in definite DATALOG programs