# Speed Cards - PAO vs PO with Dominic

**URL:** https://forum.artofmemory.com/t/speed-cards-pao-vs-po-with-dominic/35915
**Category:** General Memory Chat
**Tags:** card-memorization
**Created:** [February 2, 2019, 4:05pm UTC](https://forum.artofmemory.com/t/speed-cards-pao-vs-po-with-dominic/35915 "2019-02-02T16:05:12Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![bjoern.gumboldt](https://forum.artofmemory.com/user_avatar/forum.artofmemory.com/bjoern.gumboldt/32/16747_2.png) [@bjoern.gumboldt](https://forum.artofmemory.com/u/bjoern.gumboldt)
#### Post date: [February 9, 2019, 11:16am UTC](https://forum.artofmemory.com/t/speed-cards-pao-vs-po-with-dominic/35915/6 "2019-02-09T11:16:46Z")

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> [@docelixir](#):
>
> using 2 cards at a time - so some for of PA system.

@docelixir

It’s not a PA system… in PA, the first card gives you P and the second card gives you A. 2-card system require a lot more images than PA or PAO systems do.

The Ben System has a single image for every possible two card combination. The suit combination is the first consonant, the first card’s rank is a vowel that follows, and the second card’s rank in the second consonant. See here for more detail and another 2-card system:

> [@A New 2-Card System (Shadow System)](https://forum.artofmemory.com/t/a-new-2-card-system/28633):
>
> A note from the author, five years later: The text at the bottom of this post, which is stricken out, has been left in for historic and informative completeness. It is stricken out because it should not be applied, and because it may mislead. The Shadow System’s name has been problematic for a long time. If the method does not include shadows, as I’ve suggested openly for four years now, surely it can not be referred to as the “Shadow” System must be the rationale. Credit is due and that cr…

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