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length = tonumber(arg[1])
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if length == nil then
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print("set length please")
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exit()
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end
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if turtle.getFuelLevel() <= (3*length) then
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print("not enough fuel")
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end
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current = 0
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while current < length do
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res = turtle.dig()
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if not res then break end
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res = turtle.forward()
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if not res then break end
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current = current + 1
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res = turtle.digUp()
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if not res then break end
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end
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turtle.turnLeft()
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turtle.turnLeft()
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while current > 0 do
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turtle.dig()
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if turtle.forward() then
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current = current - 1
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end
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end
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