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 __   _      ___       _____    _____    _    _   
| || | ||   / _ \\    / ___//  |  ___|| | || | || 
| '--' ||  / //\ \\   \___ \\  | ||__   | || | || 
| .--. || |  ___  ||  /    //  | ||__   | \\_/ || 
|_|| |_|| |_||  |_|| /____//   |_____||  \____//  
`-`  `-`  `-`   `-` `-----`    `-----`    `---`

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發送短信 : Properties of attractive points in cat(0) spaces