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 |__  //    / _ \\  |      \\   / _ \\  | || | || 
   / //    | / \ || |  --  //  / //\ \\ | || | || 
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 `-----`    `---`   `------`  `-`   `-`   `---`

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發送短信 : A low-cost demonstration kit for locating an image formed by a plane mirror integrated with a ray diagram