turtle.select(16)
turtle.refuel()
for i = 1,64 do
turtle.turnLeft()

turtle.dig()
turtle.digUp()
turtle.forward()
turtle.digUp()
turtle.back()

turtle.select(3)
turtle.place()
turtle.select(1)
turtle.drop(1)
turtle.select(2)
turtle.drop(1)

turtle.turnRight()
turtle.dig()
turtle.forward()
end
turtle.select(1)