Turtle Stripmine Program

shell.run("refuel all")
while true do
x=0
while x<=64 do
turtle.digUp()
turtle.digDown()
turtle.dig()
turtle.forward()
x=x+1
end
turtle.digUp()
turtle.select(1)
turtle.placeUp()
x=2
while x<=16 do
turtle.select(x)
turtle.dropUp()
x=x+1
end
turtle.select(1)
turtle.digUp()
end