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  _____     _____     _____    _    _     ______  
 |__  //   |  ___||  / ____|| | || | ||  /_   _// 
   / //    | ||__   / //---`' | || | ||  `-| |,-  
  / //__   | ||__   \ \\___   | \\_/ ||    | ||   
 /_____||  |_____||  \_____||  \____//     |_||   
 `-----`   `-----`    `----`    `---`      `-`'

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Text this: Hand-drawn graph sketch matching for e-learning mathematics