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help with syntax

 
Van Johnson
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Can someone please explain to me what I'm doing wrong here. I'm just trying to make a list composed of the second element of each 3 tuple in a list of 3 tuples. Attached is screenshot of code and error messages. Thanks.
little_function.png
[Thumbnail for little_function.png]
 
Van Johnson
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Forgot to mention--- the language I need help with is SML
 
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