I am beginner in Elm, and going through elm-tutorial.org. I have problem in 
understanding the declaration of main function in 
https://www.elm-tutorial.org/en/02-elm-arch/02-structure.html. It says 

main : Program Never Model Msg

 What does it represent? I read under functions tutorial that, arguments 
are separated with ->. If there are no arguments then I would expect only 
one return. This don't belong to any of it. What is this way of declaring 
the function types?

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