content: -- comb :: Int -> [a] -> [[a]]
  on comb(n, lst)
      if n < 1 then
          {{}}
      else
          if not isNull(lst) then
              set {h, xs} to uncons(lst)
  
              map(curry(my cons)'s |λ|(h), comb(n - 1, xs)) & comb(n, xs)
          else
              {}
          end if
      end if
  end comb
  
  -- TEST -----------------------------------------------------------------------
  on run
  
      intercalate(linefeed, ¬
          map(unwords, comb(3, enumFromTo(0, 4))))
  
  end run
  
  -- GENERIC FUNCTIONS ----------------------------------------------------------
  
  -- cons :: a -> [a] -> [a]
  on cons(x, xs)
      {x} & xs
  end cons
  
  -- curry :: (Script|Handler) -> Script
  on curry(f)
      script
          on |λ|(a)
              script
                  on |λ|(b)
                      |λ|(a, b) of mReturn(f)
                  end |λ|
              end script
          end |λ|
      end script
  end curry
  
  -- enumFromTo :: Int -> Int -> [Int]
  on enumFromTo(m, n)
      if n < m then
          set d to -1
      else
          set d to 1
      end if
      set lst to {}
      repeat with i from m to n by d
          set end of lst to i
      end repeat
      return lst
  end enumFromTo
  
  -- intercalate :: Text -> [Text] -> Text
  on intercalate(strText, lstText)
      set {dlm, my text item delimiters} to {my text item delimiters, strText}
      set strJoined to lstText as text
      set my text item delimiters to dlm
      return strJoined
  end intercalate
  
  -- isNull :: [a] -> Bool
  on isNull(xs)
      if class of xs is string then
          xs = ""
      else
          xs = {}
      end if
  end isNull
  
  -- map :: (a -> b) -> [a] -> [b]
  on map(f, xs)
      tell mReturn(f)
          set lng to length of xs
          set lst to {}
          repeat with i from 1 to lng
              set end of lst to |λ|(item i of xs, i, xs)
          end repeat
          return lst
      end tell
  end map
  
  -- Lift 2nd class handler function into 1st class script wrapper
  -- mReturn :: Handler -> Script
  on mReturn(f)
      if class of f is script then
          f
      else
          script
              property |λ| : f
          end script
      end if
  end mReturn
  
  -- uncons :: [a] -> Maybe (a, [a])
  on uncons(xs)
      set lng to length of xs
      if lng > 0 then
          if class of xs is string then
              set cs to text items of xs
              {item 1 of cs, rest of cs}
          else
              {item 1 of xs, rest of xs}
          end if
      else
          missing value
      end if
  end uncons
  
  -- unwords :: [String] -> String
  on unwords(xs)
      intercalate(space, xs)
  end unwords
  