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|      \\ | || | || | \  / ||   / _ \\   |  _ \\  
|  --  // | || | || |  \/  ||  | / \ ||  | |_| || 
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|______//  \____//  |_|\/|_||   \___//   |_|\_\\  
`------`    `---`   `-`  `-`    `---`    `-` --`

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發送短信 : Existence of independent [1, 2]-sets in caterpillars