3260 numbers memorized in 1 hour using two digit system? (Record Holder: Zhang Ying)

Anyone knows if the actual record holder of memorizing 3260 numbers in 1 hour Zhang Ying uses a two digit system?

https://www.guinnessworldrecords.com/world-records/385445-most-decimal-digits-memorized-in-one-hour/

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I’m not sure, but there is a video of her memorizing cards here.

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Thank you!, I loved the video, specially the Zhang Ying ending!.
By the way they look 20 year old but they’re 34 and 31.

I was curious about the system she used but finally realize that two card system with 1.356 images and 3 digit system for numbers are the best options for me and I strongly believe that they’re the ones that will allow me to memorize faster.