foo01 = "foo01"
foo02 x = x ++ "foo02"
foo03 x y = x ++ y ++ "foo3"

-- I'd use this one
style1 = 
  let x = foo01
      y = foo02 x
      z = foo03 x y
    in z
    
-- wouldn't expect to see this one
style2 = foo03 foo01 . foo02 $ foo01
    
main = do
   print style1
   print style2