function turtle.selectFull()
    for i=1,16,1 do
        if turtle.getItemCount(i) > 0 then
            turtle.select(i)
            break
        end
    end
end

for i=1,50 do
    for i=1,50 do
        turtle.selectFull()
        turtle.placeDown()
        turtle.forward()
    end
    turtle.back()
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
    for i=1,50 do
        turtle.selectFull()
        turtle.placeDown()
        turtle.forward()
    end
    turtle.back()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
end