stair

function downorbust()
  while not turtle.down() do
    turtle.digDown()
    end
  end

function forwardorbust()
  while not turtle.forward() do
    turtle.dig()
    end
  end

for i=1,7 do
  downorbust()
  turtle.select(1)
  turtle.placeUp()
  turtle.turnRight()
  forwardorbust()
  turtle.turnLeft()
  for a=1,4 do
    turtle.placeUp()
    forwardorbust()
    turtle.placeUp()
    forwardorbust()
    turtle.turnLeft()
    forwardorbust()
    end
  forwardorbust()
  turtle.turnLeft()
  forwardorbust()
  end
turtle.select(2)
turtle.placeUp()