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             ___     __   _      ___      _  _   
  ____      / _ \\  | || | ||   / _ \\   | \| || 
 |    \\   / //\ \\ | '--' ||  | / \ ||  |  ' || 
 | [] ||  |  ___  ||| .--. ||  | \_/ ||  | .  || 
 |  __//  |_||  |_|||_|| |_||   \___//   |_|\_|| 
 |_|`-`   `-`   `-` `-`  `-`    `---`    `-` -`  
 `-`

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發送短信 : Logic functions and equations : examples and exercises