You have a sharp eye, @QiJitsu! Thanks. I also found five other similar typos.
And for the best system using mental load as the only metric (people who have invested years into their own system would not benefit as much), the 3-digit narrative style had the best score, yes.
Here’s some examples for you but you can choose your own personal encoding style. I’m using digit to alphabet.
A 1-digit PAO for 123456 would look like:
((1)(2)(3)), ((4)(5)(6)) = Person A doing action B on object C. Another DEF image would be made.
A 2-digit PAO (the popular choice) for the same would be
((12)(34)(56)) = Person AB doing action CD on object EF. One image.
A 3-digit PAO for the same and adding a little would be:
((123)(456)(789)) = Person ABC doing action DEF on object GHI.
The 3-digit narrative style for the same would look like:
(123) → (456) → (789)
Each number chunk is mapped to a memory data type (SEA-IT, PAO, PAIL, etc.).
When you form a visual sentence by giving the image detail so it can be visualized and associated to more easily it looks like this with more association options.
Then when a narrative traversal is introduced to associate the two visual sentences, you get this:
A simple peg system without a palace to store the images looks more like this:
with the circled area being the traversable set of pegs. The PAO is what I call a synced peg system with three different peg sets all working in sync with an anchor type. In the PAO, the usual anchor is the Person but I have seen variations. In that case, the three memory images outside the circle would be associated as a PAO visual sentence and then associated with a location in a palace where it is associated with the previous location. Narratives are better for less associations.
The criticism of not having the ability for the PAO visual sentence being able to interact with the palace location is not a fair one in my opinion. It does mean that you are constrained to a particular location. But noticing details, using your imagination to develop more features at that location, or adding enhancements will provide opportunities for associations.
Maybe with your brain wanting to develop a narrative out of the palace location images, you are more of a story person. The story behind a palace makes it a journey and journeys are very useful. For numbers, @katiek, one of the best memory atheletes in the world, uses a journey style and kicks it up a little by adding a character of some sort to each location.