Why most of the Chinese memory athletes use 2 digit system?

Most of them uses ??why ?

Do they? Like a 2 digit PAO or what? And where do you find interviews or whatever of them saying this?

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Alex has interviewed two of Chinese memory athlete and I have asked some of the Chinese athletes living in Japan and Hong Kong.

Because we use two characters form a single word and match the pronunciation to number.
Eg.16 pronounce shi liu as same as 石榴