stairs

local args = {...}
local length = 1
local height = 6

if (args[1] ~= nil) then
    length = args[1]
    if (args[2] ~= nil) then
        height = args[2]
    end
end

local function dig()
    while (not turtle.forward()) do
        turtle.dig()
    end
end

local function back()
    while (not turtle.back()) do
        turtle.turnRight()
        turtle.turnRight()
        turtle.dig()
        turtle.turnRight()
        turtle.turnRight()
    end
end


local function loop()
    for i=1, length do
        for j=1, height do
            dig()
        end
        for j=2, height do
            back()
        end
        turtle.digDown()
        turtle.down()
    end
end


loop()