[Haskell-beginners] Where is the accumulator in the expression foldr (<=<) return (replicate x oveKnight)? -- from LYAH example

Dear List, Chapter 13 of LYAH (http://learnyouahaskell.com/for-a-few-monads-more#useful-monadic-functions) has the following code block import Data.List inMany :: Int -> KnightPos -> [KnightPos] inMany x start = return start >>= foldr (<=<) return (replicate x oveKnight) What I'd like to know is where the accumulator of foldr is in this example. Regards, - Olumide