Turtle Strip Miner

local steps = 0
local left = 0
local back = 0
local right = 0
local z = true
local long = 0
local torchslot = 2
local fuelslot = 1

print"Fuel in slot 1"
print"64 Torches in slot 2"
print"Important! 64 torches!"
print"It will go for 190 meters!"
print"Because than the torches"
print"will run out"
print"Press enter to start!"
print"Robertd208 Strip Miner"
read(input)


while z == true do
        repeat
                        turtle.dig()
                        turtle.forward()
                        turtle.digUp()
                        turtle.digDown()
                        steps = steps + 1
        until steps == 3
        steps = 0
        turtle.turnLeft()

        repeat
                        turtle.dig()
                        turtle.forward()
                        turtle.digUp()
                        turtle.digDown()
                        left = left + 1
        until left == 6
        left = 0
        turtle.turnRight()
        turtle.turnRight()

        repeat
                        turtle.dig()
                        turtle.forward()
                        turtle.digUp()
                        turtle.digDown()
                        back = back + 1
        until back == 6
        back = 0

        repeat
                        turtle.dig()
                        turtle.forward()
                        turtle.digUp()
                        turtle.digDown()
                        right = right + 1
        until right == 6
        right = 0
        turtle.turnLeft()
        turtle.turnLeft()

        repeat
                        turtle.dig()
                        turtle.forward()
                        turtle.digUp()
                        turtle.digDown()
                        back = back + 1
        until back == 6
        back = 0
        turtle.turnRight()

        long = long + 1

                if turtle.getFuelLevel() < 80 then
                                                turtle.select(fuelslot)
                                                turtle.refeul()
                end

        turtle.select(torchslot)
        turtle.placeDown()
end

if(long == 500) then
        z = false
end