StairDown

turtle.select(4)
turtle.refuel(64)
turtle.select(1)
local torch=0
local step=0
while step>0 do
 turtle.dig()
 turtle.select(3)
 while turtle.compare() do
  turtle.dig()
  turtle.dig()
 end
 turtle.select(2)
 turtle.forward()
 turtle.turnRight()
 turtle.place()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.place()
 turtle.turnRight()
 turtle.digUp()
 turtle.digUp()
 turtle.select(3)
 while turtle.compareUp() do
  turtle.digUp()
  turtle.digUp()
 end
 turtle.select(2)
 turtle.up()
 turtle.placeUp()
 turtle.turnRight()
 turtle.place()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.place()
 turtle.turnRight()
 turtle.down()
 turtle.digDown()
 turtle.down()
 turtle.digDown()
 turtle.turnRight()
 turtle.place()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.place()
 turtle.turnLeft()
 turtle.select(4)
 turtle.place()
 turtle.turnRight()
 turtle.turnRight()
 turtle.select(1)
 torch = torch + 1
 if torch > 7 then
  turtle.turnRight()
  turtle.turnRight()
  turtle.up()
  turtle.place()
  turtle.down()
  turtle.turnLeft()
  turtle.turnLeft()
  torch = 0
 end
 step=step - 1
 end