Chinese system, one-third Taoism and two-thirds I Ching (3,3)

I believe the answer is:

tai chi

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'chinese system' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for tai chi that I've seen before include "Chinese martial art and system of callisthenics" , "Way to cross a fence" , "'Chinese meditation involving slow physical exercise (3,3)'" , "Chinese exercises" , "way of exercise" .)

I've seen this clue in The Guardian.

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