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no title added by alice on Wed Jul 31 06:26:51 2019

#;42> (define sixteen (<Just> 16))
#;43> (define div2 (lambda (n) (if (even? n) (<Just> (/ n 2)) <Nothing>)))
#;44> (from-just (>>= sixteen div2 div2 div2))
2
#;45> (from-just (>>= (<Just> 3) div2 div2 div2))

Error: from-just called on <Nothing>

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 _          _  __ _       
(_)_ __ ___(_)/ _(_) __ _ 
| | '__/ __| | |_| |/ _` |
| | | | (__| |  _| | (_| |
|_|_|  \___|_|_| |_|\__, |
                       |_|
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