Contribute correction: Teach Yourself Basic

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| \  / ||  |  ___||     ___     / _ \\  
|  \/  ||  | ||__      /   ||  / //\ \\ 
| .  . ||  | ||__     | [] || |  ___  ||
|_|\/|_||  |_____||    \__ || |_||  |_||
`-`  `-`   `-----`      -|_|| `-`   `-` 
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