function clearTree()
    turtle.dig()
    turtle.forward()
    local cleared = false
    local tempHeight = 0
    repeat
        local tempBlock, n = turtle.inspectUp()
        if tempBlock then
            if n.name == "minecraft:log" then
                tempHeight = tempHeight + 1
                turtle.digUp()
                turtle.up()
            end
        else
            cleared = true
        end
    until(cleared == true)
    repeat
        turtle.down()
        tempHeight = tempHeight - 1
    until (tempHeight == 0)
    turtle.back()
end

function nextTreeInRow()
    turtle.turnLeft()
    turtle.forward()
    turtle.forward()
    turtle.forward()
    turtle.forward()
    turtle.turnRight()
end

function goToNextRow()
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.forward()
    turtle.forward()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
end

function returnToStart()
    --16
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
    for i = 0, 16, 1
    do
        turtle.forward()
    end
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
end

function startOfRow()
    turtle.turnRight()
    for i = 0, 12, 1
    do
        turtle.forward()
    end
end

local length = 4
local width = 5

for w = 1, width, 1
do
    for l = 1, length, 1
    do
        clearTree()
        nextTreeInRow()
    end
    startOfRow()
end