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  _  _    _    _      _____   __   __    ______  
 | \| || | || | ||   / ___//  \ \\/ //  /_   _// 
 |  ' || | || | ||   \___ \\   \ ` //   `-| |,-  
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 |_|\_||  \____//   /____//     |_||      |_||   
 `-` -`    `---`   `-----`      `-`'      `-`'

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發送短信 : Convexity, geodetic, and hull numbers of the join of graphs