So I’m trying to learn haskell. How do I create a semi group?

I feel like my syntax is off.

data myBool = myBool Bool 

instance Semigroup myBool where
    (<>) :: myBool -> myBool -> myBool
    (<>) x y | False False = False
             | False True = False
             | True False = False
             | True True = True 

I can’t seem to find documentation that implements a semi group. Any advice?

I tried the above, and placing the (False, False) in brackets like this and still no luck.