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  _____     ______   _    _    __   __   ______   
 |__  //   /_   _// | |  | ||  \ \\/ // |      \\ 
   / //     -| ||-  | |/\| ||   \ ` //  |  --  // 
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 /_____||  /_____// |_// \_||    |_||   |______// 
 `-----`   `-----`  `-`   `-`    `-`'   `------`

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