Wither

while true do
  term.clear()
  print("Building wither")
  os.pullEvent("redstone")
  if rs.getInput("back") then
  turtle.select(1)
  turtle.place()
  turtle.up()
  turtle.place()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
  turtle.place()
  turtle.turnRight()
  turtle.forward()
  turtle.forward()
  turtle.turnLeft()
  turtle.place()
  turtle.up()
  turtle.select(2)
  turtle.place()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
  turtle.place()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
  turtle.place()
  turtle.down()
  turtle.down()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
  end
end