function TreeTop()
  turtle.dig()
  turtle.forward()
while turtle.detectUp() do
  turtle.digUp()
  turtle.up()
   end
end
function TreeBot()
    while not turtle.detectDown() do
    turtle.down()
    end
end
TreeTop()
TreeBot()
TreeTop()
TreeBot()
turtle.turnRight()
TreeTop()
TreeBot()
turtle.turnRight()
TreeTop()
TreeBot()