ReReRevised Triple Chunk

function downLayer()
    turtle.digDown()
    turtle.down()
end

function turnLeft()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
end

function turnRight()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
end

function x()
        for i = 1, 15, 1 do
        turtle.dig()
        turtle.forward()
        end
    turnLeft()
end

function zEnd()
    for i = 1, 15, 1 do
        turtle.dig()
        turtle.forward()
    end
end

function chunk12()
    for i = 1, 8, 1 do
        x()
        z()
    end
    deposit()
end

function chunk3()
    for i = 1, 7, 1 do
        x()
        z()
    end
    x()
    zEnd()
    deposit()
end


function z()
        for i = 1, 15, 1 do
        turtle.dig()
        turtle.forward()
        end
    turnRight()
end

function layer()
    chunk12()
    chunk12()
    chunk3()
end

function sleep()
    for i = 1, 4, 1 do
        turtle.turnLeft()
    end
end

function deposit()
    turtle.digUp()
    turtle.placeUp()
    s = 2
        for i = 1, 13, 1 do
            s = s + 1
            turtle.select(s)
            turtle.dropUp()
        end
    turtle.select(1)
    turtle.digUp()
end

function lavaFuel()
    turtle.select(2)
    turtle.placeUp()
    turtle.select(3)
    turtle.suckUp()
    turtle.refuel()
    turtle.dropUp()
    sleep()
    turtle.suckUp()
    turtle.refuel()
    turtle.dropUp()
    turtle.select(2)
    turtle.digUp()
    turtle.select(1)
end

function startPosition()
    turtle.turnLeft()
        for i = 1, 47, 1 do
            turtle.forward()
        end
    turtle.turnLeft()
end

function chunk(y)
    for i = 1, y - 5, 1 do
        lavaFuel()
        downLayer()
        layer()
        startPosition()
    end
end

write("What is your Y level?")
local y = read()
print("Removing Chunk ...")
chunk(y)