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I'm sorry this isn't at all easy to understand if you don't know the language. For example what is $ in this context how does <- work, how does the where clause work precisely and why is it required before the assignments? Is the colon required to separate arguments?

I'm not expecting you to give me a tutorial here in the comments and I'm 100% sure I could read a tutorial and understand in a few minutes but it doesn't seem particularly obvious if you don't know haskell.

Its easy to misread familiar as obvious.




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