Mine

modem = peripheral.wrap("right")
modem.transmit(500,501,"1")
turn = false

function invent()
  if turtle.getItemCount(15) > 0 then
    for k = 3, 16 do
      turtle.select(k)
      if (turtle.compareTo(1)) or (turtle.compareTo(2)) then
        turtle.drop()
        if turtle.getItemCount(15) > 0 then
          turtle.select(15)
          turtle.transferTo(k)
        end
      end
    end
    turtle.select(2)
    turtle.drop((turtle.getItemCount(2)-1))
    turtle.select(1)
    turtle.drop((turtle.getItemCount(1)-1))
  end
end

function dig()
  invent()
  turtle.dig()
  turtle.digUp()
  turtle.digDown()
end

function forward()
  while not turtle.forward() do
    turtle.dig()
    turtle.attack()
    os.sleep(0.5)
  end
end

for i = 1, 16 do
  for j = 1, 15 do
    dig()
    forward()
  end
  if i ~= 16 then
    if turn then
      turtle.turnRight()
    else
      turtle.turnLeft()
    end
    dig()
    forward()
    if turn then
      turtle.turnRight()
    else
      turtle.turnLeft()
    end
    turn = not turn
  end
end
turtle.digUp()
turtle.digDown()
modem.transmit(500,501,"2")