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 _    _      ___      _____      ___              
| |  | ||   / _ \\   / ____||   / _ \\      ___   
| |/\| ||  / //\ \\ / //---`'  / //\ \\    /   || 
|  /\  || |  ___  ||\ \\___   |  ___  ||  | [] || 
|_// \_|| |_||  |_|| \_____|| |_||  |_||   \__ || 
`-`   `-` `-`   `-`   `----`  `-`   `-`     -|_|| 
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發送短信 : Autonomous takeoff and landing sequence of an RC helicopter (ATLas)