module Exercise_6 where

{- Library -- nicht veraendern -}

type PairList = [(Int, Int)]

{- H1 -}

wellformed :: PairList -> Bool
wellformed = undefined

empty :: PairList
empty = undefined

member :: Int -> PairList -> Bool
member = undefined

insert :: Int -> PairList -> PairList
insert = undefined

union :: PairList -> PairList -> PairList
union = undefined

delete :: Int -> PairList -> PairList
delete = undefined


{- H2 -}

{-WETT-}
anonymize :: String -> String
anonymize = undefined
{-TTEW-}