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| || | ||   / _ \\   | \| ||   / _ \\  | \  / || 
| || | ||  / //\ \\  |  ' ||  | / \ || |  \/  || 
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  `---`   `-`   `-`  `-` -`    `---`   `-`  `-`

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發送短信 : Formation tracking of mobile robots under obstacles using only an active RGB-D camera