content: -- CARPET MODEL --------------------------------------------------------------
  
  -- sierpinskiCarpet :: Int -> [[Bool]]
  on sierpinskiCarpet(n)
  
      -- rowStates :: Int -> [Bool]
      script rowStates
          on |λ|(x, _, xs)
  
              -- cellState :: Int -> Bool
              script cellState
  
                  -- inCarpet :: Int -> Int -> Bool
                  on inCarpet(x, y)
                      if (x = 0 or y = 0) then
                          true
                      else
                          not ((x mod 3 = 1) and ¬
                              (y mod 3 = 1)) and ¬
                              inCarpet(x div 3, y div 3)
                      end if
                  end inCarpet
  
                  on |λ|(y)
                      inCarpet(x, y)
                  end |λ|
              end script
  
              map(cellState, xs)
          end |λ|
      end script
  
      map(rowStates, enumFromTo(0, (3 ^ n) - 1))
  end sierpinskiCarpet
  
  
  -- TEST ----------------------------------------------------------------------
  on run
      -- Carpets of orders 1, 2, 3
  
      set strCarpets to ¬
          intercalate(linefeed & linefeed, ¬
              map(showCarpet, enumFromTo(1, 3)))
  
      set the clipboard to strCarpets
  
      return strCarpets
  end run
  
  -- CARPET DISPLAY ------------------------------------------------------------
  
  -- showCarpet :: Int -> String
  on showCarpet(n)
  
      -- showRow :: [Bool] -> String
      script showRow
          -- showBool :: Bool -> String
          script showBool
              on |λ|(bool)
                  if bool then
                      character id 9608
                  else
                      " "
                  end if
              end |λ|
          end script
  
          on |λ|(xs)
              intercalate("", map(my showBool, xs))
          end |λ|
      end script
  
      intercalate(linefeed, map(showRow, sierpinskiCarpet(n)))
  end showCarpet
  
  
  -- GENERIC FUNCTIONS ---------------------------------------------------------
  
  -- enumFromTo :: Int -> Int -> [Int]
  on enumFromTo(m, n)
      if m > n 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
  
  -- 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
  
  -- 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
  
  -- 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
  