PA

function outerRing()
x = 1
  if turtle.getItemCount(x) == 0 then
        repeat turtle.select(x+1)
        x = x + 1
           if x == 16 then
                x = 1
                y = 2
           end
		   if y == 2 then
				os.reboot()
			end
        until turtle.getItemCount(x) > 0
    end
	turtle.placeDown()
end
function innerRing()
x = 1
  if turtle.getItemCount(x) == 0 then
        repeat turtle.select(x+1)
        x = x + 1
           if x == 16 then
                x = 1
                y = 2
           end
		   if y == 2 then
				os.reboot()
			end
        until turtle.getItemCount(x) > 0
    end
	turtle.placeDown()
end
function place()
 turtle.select(1)
	x = 1
  if turtle.getItemCount(x) == 0 then
        repeat turtle.select(x+1)
        x = x + 1
           if x == 16 then
                x = 1
                y = 2
           end
		   if y == 2 then
				os.reboot()
			end
        until turtle.getItemCount(x) > 0
    end
	turtle.placeUp()
	turtle.placeDown()
end

for k = 1,4 do

  for i = 1,39 do
  	innerRing()
  	turtle.forward()
  end
  turtle.turnRight()
  end
  turtle.turnRight()
  turtle.forward()
  turtle.down()
  turtle.turnLeft()
for k = 1,4 do

  for i = 1,40 do
  	place()
  	turtle.forward()
  end
  turtle.turnRight()
 end
 for k = 1,4 do

  for i = 1,41 do
  	place()
  	turtle.forward()
  end
  turtle.turnRight()
 end