QA 40x40 digger

function outerRing()
x = 1
	turtle.digDown()
end
function place()
 	turtle.digUp()
	turtle.digDown()
end

for k = 1,4 do

  for i = 1,41 do
  	innerRing()
  	turtle.forward()
  end
  turtle.turnRight()
  end
  turtle.forward()
  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
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.up()
  turtle.turnLeft()
 for k = 1,4 do

  for i = 1,39 do
   outerRing()
  	turtle.forward()
  end
  turtle.turnRight()
 end