multiplyBy :: Int -> (Int -> Int)
double :: Int -> Int

--
-- AUFGABE BEGINNT HIER
--

multiplyBy =  -- Fill in
double =  -- Fill in using partial application
triple = -- Fill in using partial application

--
-- AUFGABE ENDET HIER
--

-- Test cases
main = do
    print (double 4)  -- Expected output: 8
    print (double 7)  -- Expected output: 14
    print (triple 4) -- Expected output: 12