lumber

turtle.detect()
turtle.dig()
turtle.forward()
while turtle.detectUp() == true do
 turtle.digUp()
 turtle.up()
end
print("Job done!")
print("Returning to start.")
while turtle.detectUp() == false do
 turtle.down()
 if turtle.detectDown() == true then
  break
 end
end
turtle.back()
turtle.select(16)
turtle.refuel()