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    ___     / _ \\   /_____// | || | || |      \\ 
   /   ||  / //\ \\  `____ `  | || | || |  --  // 
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    -|_|| `-`   `-`  /_//       `---`   `------`  
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發送短信 : Development of a Gamified Number Line App for Teaching Estimation and Number Sense in Grades 1 to 7