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function - Haskell Rewriting Min Class

I'm quite new to Haskell and I'm writing a function that is similar to min instead of just accepting 2 values it'll accept 3. I've worked out the class as shown here:

min3 :: a -> a -> a -> a

However what would I put with the function itself after writing how many input variables?

min3 x y z = 

This is probably stupidly easy and I'm missing something but if you could please help me out I would really appreciate it.

Thanks!

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You can also write it as:

min3 :: Ord a => a -> a -> a -> a
min3 = ((min .) .) min

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