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  _  _      ___      _____      ___      ______  
 | \| ||   / _ \\   /  ___||   / _ \\   /_____// 
 |  ' ||  / //\ \\ | // __    / //\ \\  `____ `  
 | .  || |  ___  ||| \\_\ || |  ___  || /___//   
 |_|\_|| |_||  |_|| \____//  |_||  |_|| `__ `    
 `-` -`  `-`   `-`   `---`   `-`   `-`  /_//     
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發送短信 : Preservation of integrity constraints in definite DATALOG programs